ࡱ>  Xbjbj DjjASl$@@@P@|vABPILIII9TM[)_$N n#aT"9Taa#ÆII{ 8(ÆÆÆa<IIÆaÆ" ÆǻlF˾IB `g28@Uz8 3*˾4`<]n464˾ÆUse of Ontologies in Pervasive Computing Environments Anand Ranganathan Robert E. McGrath Roy H. Campbell M. Dennis Mickunas Abstract: Pervasive Computing Environments consist of a large number of independent entities that help transform physical spaces into computationally active and intelligent spaces. These entities could be devices, applications, services or users. A lot of work has been done to enable the different entities to interact with each other. However, not much work has been done in ensuring that the different entities are on the same semantic plane when they interact with each other. To tackle this problem, we have used semantic web technologies to attach semantics to various concepts in Pervasive Environments. We have developed ontologies to describe different aspects of these environments. Ontologies have been used to make information systems more usable. They allow different entities to have a common understanding of various terms and concepts and smoothen their interaction. They enable semantic discovery of entities, allowing requests to be semantically matched with advertisements. The ontologies also describe the different kinds of operations an entity supports like asking queries and sending commands. This makes it easier for autonomous entities to interact with one another. It also allows the generation of intelligent user interfaces that allow humans to interact with these entities easily. The ontologies also allow external agents (such as new entities that enter the environment or entities that access the environment over the web) to easily interact with the environment. Finally, we use ontologies coupled with description logic to ensure that the system is always in a consistent state. This helps the system meet various security and safety constraints. We have incorporated the use of ontologies in our framework for pervasive computing, Gaia[]. While we have used ontologies in the pervasive computing scenario, many of the issues tackled are applicable to any distributed system or multi-agent system. Introduction Pervasive (or Ubiquitous) Computing Environments are physical environments saturated with computing and communication, yet gracefully integrated with human users [citation]. These environments advocate the construction of massively distributed computing environments that feature a large number of autonomous entities (or agents). These entities could be devices, applications, services, databases or users. Various types of middleware (based on CORBA, Java RMI, SOAP, etc.) have been developed that enable communication between different entities. However, existing middleware have no facilities to ensure semantic interoperability between the different entities. Since different entities are autonomous, it is infeasible to expect all of them to attach the same semantics to different concepts on their own. In order to enable semantic interoperability between different entities, we take recourse to methods used in the Semantic Web  ADDIN ENRfu [5, 67]. The so-called Semantic Web is a set of emerging technologies mostly adopted from earlier work on intelligent agents  ADDIN ENRfu [5, 67]. The essence of the Semantic Web is a set of technology-independent, open standards for the exchange of descriptions of entities and relationships  ADDIN ENRfu [13, 16, 24, 32, 37, 41] This includes XML-based languages and formal models for Knowledge Bases. While the Semantic Web was designed to enhance Web search and agents, we show that it is well suited to some of the requirements of a ubicomp system. In this study, ontologies written in DAML+OIL XML [] to describe various parts of the GAIA environment. An Ontology Service manages a system ontology and operations on DAML ontologies. The ontologies are loaded into a Knowledge Base (KB), built on the FaCT Server []. The KB implements automated reasoning algorithms to prove the ontology is consistent with the KB, and to answer logical queries about the KB. An ontology is a formal vocabulary. Ontologies establish a joint terminology between members of a community of interest. These members can be humans or automated agents. The DAML+OIL provides a language to share ontologies via XML documents, and the Ontology Service provides a common interface for using the ontologies. Each entity in our environment uses the vocabulary and concepts defined in one or more ontologies. When two different entities talk to each other, they know which ontology the other entity uses and can thus understand the semantics of what the other entity is saying. The use of Semantic Web technologies to describe these environments also allows web-based entities to access and interact with these environments. Ontologies can be used for for describing various concepts in a Pervasive Computing Environment. We have developed ontologies that describe the different kinds of entities and their properties. These ontologies define different kinds of applications, services, devices, users, data sources and other entities. They also describe various relations between the different entities and establish axioms on the properties of these entities (written in Description Logic) that must always be satisfied. We have an ontology that describes the different types of contextual information in GAIA. Context plays a huge role in pervasive environments applications in pervasive and mobile environments need to be context-aware so that they can adapt themselves to rapidly changing situations. Applications in pervasive environments use different kinds of contexts (like location of people, activities of individuals or groups, weather information, etc.) The ontologies that describe the pervasive environment greatly help in the smooth operation of the environment. Some of the ways in which we use ontologies in our pervasive environment are: Checking to see if the descriptions of different entities are consistent with the axioms defined in the ontology. This also helps ensuring that certain security and safety constraints are met by the environment Enabling semantic discovery of entities Allowing users to gain a better understanding of the environment and how different pieces relate to each other Allowing both humans and automated agents to perform searches on different components easily Allowing both humans and automated agents to interact with different entities easily (say, by sending them various commands) Allowing both humans and automated agents to specify rules for context-sensitive behavior of different entities easily Enabling new entities (which follow different ontologies) to interact with the system easily. Providing ways for ontology interoperability also allows different pervasive environments to interact with one another. In this report, we describe how ontologies have been incorporated in our pervasive computing environment, Gaia. Section 2 describes the different kinds of ontologies we have in our system. Section 3 gives details on some of the ways in which we use ontologies to ease the interaction between different entities in the system. Section 4 gives some implementation details. Section 5 describes our experiences with using ontologies. Section 6 describes related work in the field and Section 7 concludes the paper. Background Gaia Gaia is our infrastructure for Smart Spaces, which are ubiquitous computing environments that encompass physical spaces. Gaia converts physical spaces and the ubiquitous computing devices they contain into a programmable computing system. It offers services to manage and program a space and its associated state. Gaia is similar to traditional operating systems in that it manages the tasks common to all applications built for physical spaces. Each space is self contained, but may interact with other spaces. Gaia provides core services, including events, entity presence (devices, users and services), discovery and naming. By specifying well defined interfaces to services, applications may be built in a generic way so that they are able to run in arbitrary active spaces. The core services are started through a bootstrap protocol that starts the Gaia infrastructure. Gaia has served as our test-bed for the use of ontologies in ubiquitous computing environments. Semantic Web Technology Object registries, such as the CORBA Naming Service and the RMI Registry, provide a basic mechanism for finding well-known (i.e., known in advance) services. Brokers, such as the CORBA Trader Service, provide the capability to locate services by attributes. Many other services provide similar features, including LDAP  ADDIN ENRfu [77], JINI  ADDIN ENRfu [12], and Microsofts Registry  ADDIN ENRfu [46]. Conventional distributed object technology, such as CORBA, DCOM, or Java RMI, defines only part of this model or schema, primarily the interfaces and formats. The contentthe valid attributes and valuesis left to communities and applications. For example, the CORBA Trading Service provides interfaces and protocols for describing objects with a set of attributes (properties), which can be queried with the Trader Constraint Language (TCL). A CORBA Service Type defines the attributes that should be used, i.e., the schema for the properties. CORBA Properties are essentially a vocabulary or ontology for describing the objects. The CORBA standard provides minimal standards to manage properties, and the Trading Service does not define the properties of objects, or the values of properties. By design, the specification of valid properties and relationships is left to communities  ADDIN ENRfu [43], such as the CORBA Domain Task Forces see  ADDIN ENRfu [42]. In recent years, the Web Services architecture has emerged as a set of standards for publishing, discovering, and composing independent services in an open network  ADDIN ENRfu [69, 71]. The Global Grid Forum Grid Services  ADDIN ENRfu [62], and the Microsoft .NET framework  ADDIN ENRfu [25, 38] are built on top of the Web Services architecture. This activity aims to improve electronic commerce by enabling open markets using networks and Web services  ADDIN ENRfu [70, 74]. A key part of this activity is matchmaking, or mutual discovery by producers and consumers  ADDIN ENRfu [20, 61, 69]. The Web Services architecture is an abstract framework which defines the problems, generic architecture, and general approach  ADDIN ENRfu [69, 70]. Essentially, the Web Services architecture is a virtualization of a generic registry. There may be different technical realizations of this architecture, but the current work has focused on a solutions based on XML, which may be implemented with any underlying database or registry. The message passing protocol uses SOAP  ADDIN ENRfu [68], the content of the messages is delivered in the Web Services Description Language (WSDL)  ADDIN ENRfu [71, 72]. The Web Services architecture is designed to provide service discovery, at least in an electronic commerce forum. From the use cases and requirements it is clear that there is a need to manage descriptions and services from multiple autonomous sources, but the Web Services standards have not yet defined the semantic layer  ADDIN ENRfu [70, 73, 74]. Semantic Web ontologies are designed to fill this role. The semantic web is a set of emerging standards for open exchange of resource descriptions. In the Web community, a resource is a generic term for any document, object, or service that can be accessed via the WWW. The objects and services of a ubicomp system can be considered to be instances of such resources. The Semantic Web standards of interest include the XML languages which, with their formal underpinnings, are designed to be an open language for exchanging information between Knowledge Bases. The World Wide Web standards provide a universal address space (URIs  ADDIN ENRfu [4]), and the XML language is a universal standard for content markup. The XML standard assures a universal (and multilingual) namespace and syntax ( ADDIN ENRfu [63, 64, 75, 76]): an XML document is guaranteed to be parseable, but there is no constraint on how to interpret the tokens. The same information can be encoded in many ways using XML. The Resource Description Framework (RDF) defines an XML language for expressing entity-relationship diagrams  ADDIN ENRfu [66]. Essentially, RDF defines standard tags for expressing a network of related objects. However, RDF does not specify a single logical model of entities or relationships: the same relationship could be encoded in many ways. XML and RDF are necessary but not sufficient for the exchange of complex information in open systems. The additional requirement is one or more standard logical models, to constrain the use and interpretation of tags. The DARPA Agent Markup Language (DAML) and Ontology Interchange Language (OIL) are XML languages (combined as DAML+OIL) are designed to provide the required models. The OIL is a language for describing formal vocabularies (ontologies), essentially a meta-format for schemas  ADDIN ENRfu [16, 29]. The DAML is a language for describing entity-relationship diagrams that conform to a schema (i.e., an OIL ontology)  ADDIN ENRfu [1, 7]. The DAML+OIL language is an XML binding to these formal logical models. In a nutshell, the DAML+OIL language uses the mechanisms of XML to deliver well-defined logic programs. Therefore, unlike XML and RDF alone, a DAML+OIL document has a single, universal interpretation. While there may be many ways to express the same idea in DAML+OIL, a given DAML+OIL document has only one correct interpretation. The DAML+OIL language, with its formal underpinnings, is designed to be an open language for exchanging information between Knowledge Bases. A Knowledge Base (KB) is a database augmented with automated reasoning capabilities. A KB not only answers queries by match, it also can deduce results using automated reasoning. The automated reasoning also can maintain the consistency of the KB. A KB is usually defined to contain two broad classes of information: intensional: a model of the objects, attributes, states, and relationships of the system. (What can exist.) extensional: an assertion of the current state of the system (What does exists) The model and instances are described in a formal logical model (e.g., using a formal language based on a Description Logic), which can be validated and automatically reasoned about. The standard XML languages (DAML+OIL) are used to load, update and query the KB. For example, the Protege-2000  ADDIN ENRfu [40, 41], CLASSIC  ADDIN ENRfu [36], or OntoMerge  ADDIN ENRfu [45] might be used to implement a Knowledge Base. To apply Semantic Web technology to a ubicomp system, the distributed object technology will be augmented with a Knowledge Base or federation of KBs. The Knowledge Base (KB) will have a description of the software object model, the objects currently instantiated, their properties, and relationships ( REF _Ref29371513 \h  \* MERGEFORMAT Figure 1). The KB may also contain descriptions of aspects of the real world, as well as abstract information such as policies. In a system such as CORBA, the KB and reasoning services can be implemented as a CORBA service (e.g.,  ADDIN ENRfu [3]), or more likely used to re-implement standard services such as the CORBA Trader Service. These arguments apply equally well to other similar systems such as JINI and DCOM. In this approach, the KB augments the basic distributed object system (e.g., CORBA) by providing a formal schema for the system, along with a more complete model of the state of the system, and automatic reasoning capabilities. The latter two are important for maintaining the consistency of the system as it evolves. In turn, the distributed object technology augments the KB, providing interfaces and protocols to access the world that the KB attempts to model. Keeping a KB consistent with the world it supposedly models is usually difficult; but a reflective distributed system such as GAIA ( ADDIN ENRfu [53]) enables the KB to track the world more closely.  Figure  SEQ Figure \* ARABIC 1. The relationship of real objects, OO software, and the KB. The combination of these two technologies creates a powerful synergy, perhaps a new intelligent CORBA. To realize this vision, it is necessary to analyze the relationships between the CORBA system and the KB. The overall goal is to have a single consistent system, in which every CORBA operation is reflected in the KB, and all constraints and relations in the KB are implemented in the running CORBA system. Clearly, this may be a large and difficult task. Ontologies The terminology or vocabularies used by a domain is developed to express the concepts that the experts in this domain need to exchange information on the topic. The terms represent the essential concepts of the domain. However, the specific terms used are, of course, arbitrary. This leads to the classic problems of vocabulary control in information systems  ADDIN ENRfu [31]: in many cases, the same concept or very similar concept may have many different terms applied to it in different domain contexts. Humans are quite used to quickly switching and matching words from different contexts. Indeed, specialized technical training involves learning domain vocabularies and mapping them to other domain vocabularies. Unfortunately, this process is very difficult for machines  ADDIN ENRfu [55]. Domain experts and standards bodies will define the concepts develop the formal vocabulary for domains reusing higher-level vocabularies and vocabularies from other domains when they are available and apply. An important goal of an ontology is to formalize this process, and to generate a formal specification of the domain-specific vocabulary. An ontology is a formal vocabulary and grammar of concepts  ADDIN ENRfu [13, 21, 65]. The Semantic Web XML languages addresses this process with schemas based on formal ontologies. The Ontology Information Language (OIL) language is an XML-based language that enables such information to be retrieved in an open network  ADDIN ENRfu [8, 16, 56]. The OIL is not simply a record format, it defines logical rules to enable the document to be validated (proved correct) and then interpreted into a specific local schema. Using the DARPA Agent Markup Language (DAML), a query can refer to the ontology used to construct it, with a URL for an OIL document  ADDIN ENRfu [1, 7]. In turn, the receiver can retrieve the ontology if needed, parse it, and interpret the query into its own preferred vocabulary. Similarly, the OIL can be used to publish the schema (ontology) of the library as an XML document. This mechanism enables the parties to share their schemas at run time, using a standard machine interpretable format. Logical foundations There have been many approaches to automated reasoning. The Semantic Web has focused on Description Logics (also known as Concept Languages), which represent classes of individuals and roles are binary relationships used to specify properties or attributes  ADDIN ENRfu [18, 19, 21, 29]  ADDIN ENRfu [20, 30, 47, 51]. Description Logics have been demonstrated to provide substantial expressive and reasoning power with efficient implementations. Description Logics are a general class of logic are specifically designed to model vocabularies (hence the name)  ADDIN ENRfu [9, 18-21, 29, 30, 47, 51]. Description Logics are descendants of Semantic Networks  ADDIN ENRfu [50] more flexible than frames  ADDIN ENRfu [39]. An object-oriented language can be stated as hierarchies of classes (frames) and types (slots), which can be expressed as a few logical assertions in a Description Logic. When a class hierarchy is expressed in a Description Logic, the model is proved satisfiable if and only if the class hierarchy is correct (i.e., type checking is correct). Of course, it is not necessary to implement a general-purpose logical system to implement type checking. A Description Logic has a formal semantics, which can be used to automatically reason about the KB. The reasoning includes the ability to deduce answers to important questions including  ADDIN ENRfu [18-21, 29, 30, 47, 51]: Concept satisfiability whether concept C can exist Subsumption is concept C is a case of concept D Consistency is the entire KB satisfiable Instance Checking is an assertion satisfied. These questions can represent important logical requirements for ubicomp systems. For example, matching a query (service request) to a service (advertisement) can be implemented as logic operations on two concepts (C1, C2). C1 matches C2 if: C1 is equivalent to C2, or C2 is a sub-concept of C2, or C1 is a sub-concept of a concept subsumed by C2, or C1 is a sub-concept of a direct super-concept of C2 whose intersection with C2 is satisfiable (after  ADDIN ENRfu [20], p. 9) Systems built using Description Logic are used to create a Knowledge Base, composed of two components: a schema defining classes, properties, and relations among classes (termed the Tbox) a (partial) instantiation of the schema, containing assertions about individuals (termed the Abox). Basically, the former is the model of what can be true, the latter is the model of what currently is true. Description Logics have been implemented in efficient automated reasoning systems, such as FaCT  ADDIN ENRfu [28].  ADDIN ENRfu [39, 50] The SHIQ(d) logic is a specific Description Logic which is expressive but can be implement efficiently. The FaCT reasoning engine implements the SHIQ(d) logic  ADDIN ENRfu [28, 29], and has a CORBA interface  ADDIN ENRfu [2, 26]. The FaCT system is programmed in the OIL language  ADDIN ENRfu [15, 16, 27]. The OIL program is compiled into a set of assertions which are used to construct a Knowledge Base (KB). The KB can be tested with FaCT to prove satisfiability (logical consistency) and subsumption (logical equivalence). The SHIQ logic supports the concepts required for the definition of ontologies (the Tbox), but cannot express individuals (needed for the Abox). Gonzalez-Castillo, et al.  ADDIN ENRfu [20] show that the SHOQ(D) should be used instead, even though it lacks inverses. Algorithms to implement subsumption and satisfiability are known for SHOQ(D) ( ADDIN ENRfu [47]), although implementations are not available. 2.5. Semantic Web Software This experiment is made possible by the use of available free software with open interfaces. The FaCT reasoning engine is a stand-alone server with a CORBA interface  ADDIN ENRfu [2, 26, 28]. The interface is essentially the OIL language, plus logic queries (satisfiability and subsumption). The OIL program is compiled into a set of assertions which are sent to the FaCT server to construct a Knowledge Base (KB). The KB can be tested with FaCT to prove satisfiability (logical consistency) and subsumption (logical equivalence). The uk.ac.man.cs.img.oil package is available as part of the OILed tool  ADDIN ENRfu [44]. This package implements reading and writing DAML+OIL XML documents. A DAML document is translated into an internal data structure (Ontology). The oil package can verify the ontology by converting it to a series of assertions in OIL, which are sent to the FaCT reasoner to create a Knowledge Base (KB). The oil package then queries to test that the classes and individuals (instances) in the ontology are satisfiable in the KB. If every class and instance in the FaCT KB is satisfiable, then the KB is consistent and the ontology is correct.  REF _Ref15699036 \* MERGEFORMAT Figure 2 shows the main components used. Together, these packages are capable of validating any OIL ontology from a DAML XML file. In addition, the OILed tool  ADDIN ENRfu [44] can be used to create and validate DAML files. Furthermore, ontologies can import other ontologies (using XML namespaces), and the oil package can create and validate an ontology composed from multiple DAML files retrieved from the Internet.  Figure  SEQ Figure \* ARABIC 2. The logic programming components. Kinds of Ontologies in Gaia We use ontologies to describe various parts of our pervasive environment, Gaia. In particular, we have ontologies that have meta-data about the different kinds of entities in our environment. We also have ontologies to describe the different kinds of contextual information in our environment. Ontologies for different entities Pervasive computing environments have a large number of different types of entities. There are different kinds of devices ranging from small wearable devices and handhelds to large wall displays and powerful servers. There are many services that help in the functioning of the environment. These services include Lookup Services, Authentication and Access Control services, Event Services, etc. There are different kinds of applications like music players, PowerPoint viewers, drawing applications, etc. Finally, there are the users of the environment who have different roles (like student, administrator, etc.). Ontologies provide a nice way of having a taxonomy of the different kinds of entities. We have developed ontologies that define the different kinds of entities, provide meta-data about them and describe how they relate to each other. These ontologies are written in DAML+OIL. In addition to ontologies that provide meta-data about the different classes of entities. each instance (or individual) also has a description in DAML+OIL that gives the properties of this instance. This DAML+OIL description must be consistent with the meta-data description of the class in the ontology. For example, the ontology has a class called MP3File and it requires all instances of this class to have certain attributes like artist, genre, album, length, etc. Thus, every description of an mp3 file has to have these fields. The description of every instance is checked to see that it is satisfiable with the concepts defined in the ontology. Some of the classes in our ontology that describe entities (along with a brief description of them) are shown in Table 1.  REF _Ref29458389 Figure 3 shows the logical hierarchy of these classes. EntityClass of all objects in the system - includes all applications, services, devices and usersService Subclass of Entity, the Service Class encompasses all those components that provide some form of service (!!) It includes both kernel services like Space Repository, etc. as well as other services like Context Providers.CommandableService A subclass of Service, it includes all those services to which you can send a command to be executedSearchableService A subclass of Service, it includes all those services to which you can send a query and then get a set of results in returnMP3Server A subclass of both CommandableService and SearchableService, it maintains a list of songs - this list can be searched by certain attributes and it can also be sent commands to play songsApplication Subclass of Entity, this represents the class of all applications in the environment - eg. powerpoint, scribble applications, etc. PowerPointApplication Subclass of Application, this class describes the different kinds of PowerPoint ApplicationsUser Subclass of entitiy, this is the class of all users (or people) in the environmentDeviceSubclass of entitiy, this is the class of all devices in the system - UOBHosts, cameras, fingerprint recognizers, etc.Table  SEQ Table \* ARABIC 1 : Some of the classes in the ontology  Figure  SEQ Figure \* ARABIC 3 A Pervasive Computing Environment is very dynamic. New kinds of entities can be added to the environment at any time. The Ontology Server allows adding new classes and properties to the existing ontologies at any time. For this, a new ontology describing the new entities is first developed. This new ontology is then added to the shared ontology using bridge concepts that relate classes and properties in the new ontology to existing classes and properties in the shared ontology. These bridge concepts are typically in subsumption relations that define the new entity to be a subclass of an existing class of entities. For example, if a new kind of fingerprint recognizer is added to the system, the bridge concept may state that it is a subclass of AuthenticationDevices. An example of a class in our ontology Each type of entity in Gaia is described a class in our ontology. This class defines all properties of the entity like the search interfaces it exposes, the types of commands that can be sent to it, the data-types it deals with, etc. As an example, we have included a part of the description of an MP3 Server in Listing 1, below. This entity maintains a set of songs in MP3 forma in its database. It allows other entities to search this set of songs using various parameters like name of artist, type of song, etc. It can also be sent commands for playing songs other entities can either request a particular song to be played or a random song to be played. In addition, there is a human-understandable description about the entity. This is specifically meant for the average user who wants to know more about the entity in a simple language. The entity is described in terms of restrictions on various properties. The superclasses of an entity also give more of an idea about the entity. In the case of the MP3 Server, it is declared as a subclass of SearchableService (lines 12-16) and of CommandableService (lines 17-21) this means it supports searches and execution of commands. Other properties of the MP3Server according to its description are that it executes MP3Files (lines 22-33), its search schema is defined in the class MP3Attributes (lines 34-45), and that there are two types of commands that can be sent to it MP3ServerPlay (lines 46-57) and MP3ServerRandomPlay (lines 58-69). In addition, there is a human-understable description of the class (lines 5-8). The DAML XML maps to statements of Description Logic (see  ADDIN ENRfu [17, 22, 23, 51]), which can be asserted to a Knowledge Base and checked. 3.2. Ontologies for context information GAIA has a context infrastructure that enables applications obtain and use different kinds of contexts. This infrastructure consists of sensors that sense various contexts, reasoners that infer new context information from sensed data and applications that make use of context to adapt the way they behave. We use ontologies to describe context information. This ensures that the different entities that use context have the same semantic understanding of contextual information. The use of ontology to describe context information is useful for checking the validity of context information. It also makes it easier to specify the behavior of context-aware applications since we know the types of contexts that are available and their structure. There are different types of contexts that can be used by applications [citation]. These include physical contexts (like location, time), environmental contexts (weather, light and sound levels), informational contexts (stock quotes, sports scores), personal contexts (health, mood, schedule, activity), social contexts (group activity, social relationships, whom one is in a room with), application contexts (email, websites visited) and system contexts (network traffic, status of printers). We represent contexts as predicates. We follow a convention where the name of the predicate is the type of context that is being described (like location, temperature or time). The structure of the context predicate depends on the type of context. This structure is defined in the ontology. For example, location context information must have three fields - a subject that is a person or object, a preposition or a verb like entering, leaving, or in and a location like a room or a city. For instance, Location ( Chris , entering , room 3231) is a valid location context. Each type of context corresponds to a class in the ontology. The fields of the context are defined as restrictions on this class. Other example context predicates are: Temperature ( room 3231 , = , 98 F) Sister( venus , serena) StockQuote( msft , > , $60) PrinterStatus( srgalw1 printer queue , is , empty) Time( New York , < , 12:00 01/01/01) An example of using ontologies to describe context Each type of context is defined by a class in the ontology. As an example, we give the DAML+OIL description of temperature context in Listing 2, below. According to this description, the Temperature context is a subclass of the more generic WeatherInformation context (lines 10-15). Other information about this context is that it consists of a subject, which can be either a PhysicalPlace or a Person (lines 16-50); it has a relater which is a ComparisonOperator (lines 51-64); and it has an object which is of type TemperatureValue (i.e. either in Centigrade or in Fahrenheit) (lines 65-78). An instance of a temperature context based on this description is Temperature( Champaign, > , 40F). Use of Ontologies in Gaia The ontologies that describe entities and context information are used to enable different parts of the pervasive environment interact with each other easily. In this section, we describe some of the ways in which ontologies are used in our pervasive environment, Gaia. Configuration Management: Validating Descriptions A key advantage of using ontologies for describing entities and contextual information is that we can determine whether these descriptions are valid with respect to the schema defined by the ontology. When a new entity is introduced into the system, its description can be checked against the existing ontology to see whether it is satisfiable. If the description is not consistent with the concepts described in the ontology, then either the description is faulty (in which case the owner of the entity/context has to develop a correct description of the entity/context), or there are safety or security issues with the new entity or context. For example, the ontology may dictate that the power of a bulb in the environment should have a value between 20 and 50 Watt. In that case, if somebody tries to install a new 100 Watt bulb, then the description of the new bulb would be inconsistent with the ontology and a safety warning may be generated. When a new entity is first introduced into the environment, its description in DAML+OIL (or in any other format) is sent to the Ontology Server to make sure that the description of this instance is not inconsistent with the definition of the class of the entity and other axioms that are laid out in the ontologies. If there is a logical inconsistency, then the developer of that entity is required to revise the description of the entity (or change the properties of the entity) to ensure that it does meet the constraints defined in the ontologies. The operation of checking the logical consistency of the description of an entity is computationally intensive; and hence is performed only the first time the entity is introduced into the environment (or whenever the description of the entity changes). It is not performed every time the Space is bootstrapped. Formal ontologies also increase the capability to use descriptions from different, autonomous sources. The DAML+OIL ontologies can be published, to enable autonomous developers and service providers to describe their products with the correct vocabulary. Conversely, autonomous entities can specify the correct formal vocabulary to be used to interpret their descriptions by referring to the relevant DAML+OIL ontology. These actions require more than the URL: the formal semantics defined for DAML+OIL ensures that ontologies from different sources can be used together. Defining terms used in the environment One of main uses of ontologies in a ubiquitous computing environment is that it allows us to define all the terms that can be used in the environment. Ontologies allow us to attach precise semantics to various terms and clearly define the relationships between different terms. It, thus, prevents semantic ambiguities where different entities in the environment have different ideas of what a particular term means. Different entities in the environment can refer to the ontology to get a definition of a term, in case they are not sure. For example, we have defined the term meeting as a subclass of GroupActivity. A meeting is defined to have a location, a time, an agenda (optional) and a set of participants. It has a human-understandable comment that goes as follows A meeting is an activity that is performed by a group of people. A meeting involves different people coming together at a particular time or place with a common purpose in mind. Thus, both humans and automated entities in the environment can get a clear understanding of the term meeting by looking it up in the ontology. Semantic Discovery and Matchmaking A ubiquitous system is an open system, in which the components are heterogeneous and autonomous. Before entities can compose and collaborate to deliver services, they must discover each other. Conventional object registries provide a limited capability for object discovery, and so-called discovery protocols (such as Salutation  ADDIN ENRfu [48] or JINI  ADDIN ENRfu [12]), support limited ability to spontaneously discover entities on a network. For a ubicomp system, these protocols must be enhanced to provide semantic discovery  ADDIN ENRfu [33]: it must be possible to discover all and only the relevant entities, without knowing in advance what will be relevant. This process has also been termed matchmaking  ADDIN ENRfu [61]. Semantic discovery can involve several related activities: advertising, querying, and browsing. In each case, the parties exchange structured records describing the offered service (advertising, response to query) or the desired service (querying). The exchange may be manual (browsing), real-time (a query to discover the current local state of the system), persistent (a standing query, i.e., to be notified). The exchange may be a push (advertisement, notification), pull (query), or some combination. In all cases, it is critical that the data is filtered, to select a set that best matches the intentions of the parties.  ADDIN ENRfu [61] summarizes these requirements. Object registries, such as the CORBA Naming Service, provide a basic mechanism for finding well-known (i.e., known in advance) services. Brokers, such as the CORBA Trader Service, provide the capability to locate services by attributes. Many other services provide similar features, including LDAP  ADDIN ENRfu [77], JINI  ADDIN ENRfu [12], and Microsofts Registry  ADDIN ENRfu [46]. In the case of a ubicomp system, the entities of interest are the active components of the system, which includes devices, services, and physical entities in the environments. We define ontologies for describing different categories of entities, and use the Semantic Web technologies to enable semantic discovery and matchmaking across the many kinds of entities. One of the main issues with traditional discovery services is that in a massively distributed environment with a large number of autonomous entities, it is unrealistic to expect advertisements and requests to be equivalent, or even that there exists a service that fulfills exactly the needs of the requester. Advertisers and requesters could have very different perspectives and knowledge about the same service. Semantic discovery aims to bridge this semantic gap between advertisers and requesters. A service that tries to provide semantic discovery would use its knowledge of the environment and its semantic understanding of the advertisement and the request to recognize that the two are related, even if they, say, use different terms or different concepts. DAML+OIL is based on description logics, that supports some of the operations required for semantic discovery like classification and subsumption. DAML+OIL also allows the definition of relations between concepts. Variations of discovery and matchmaking are required for many functions of a ubiquitous computing environment. This section discusses three different kinds of discovery: human interaction, searches, and interaction of components. Better Interaction with Humans An important part of pervasive computing environments are the humans in the environment. These environments automate several tasks and proactively perform various actions to make life easier for the humans. Ontologies can be used to make better user interfaces and allow these environments to interact with humans in a more intelligent way. Very often users, especially novice users, do not know what various terms used in interfaces mean or how different parts of the system are related to each other. The problem is especially acute in pervasive environments with its myriad devices, applications and services. It is very easy for users to get lost in these environments especially if they do not have a clear model of how the system works. Ontologies can be used to alleviate this problem. Ontologies describe different parts of the system, the various terms used and how various parts interact with each other. All classes and properties in the ontology also have documentation that describe them in greater detail in user-understandable language. Users can thus browse or search the ontology to better understand the system. Ontologies enable semantic interoperability between users and the system. We have developed a GUI called the Ontology Explorer that allows users to browse the ontology describing the environment. Users can search for different classes in the ontology. He can then browse the results for example, he can get documentation about the classes returned, get properties of the class, etc. He can also get instances of the class. For example, if the user searches using the string MP3, he gets all classes in the Ontology that deals with MP3 this includes an MP3 Server, MP3 Files, MP3 Attributes, etc. He can then get more details about the classes. He can get instances of MP3 Files and interact with the MP3 Server, as described in the next sections. More details about the Ontology Explorer as well as screenshots can be found in the Implementation section. Improved Searches One of the most frequent activities in computing is search. Both users as well as computer programs need to search data sources for relevant information. Components that allow searches to take place expose their schemas in the ontology. They can also specify which fields in the query are required to be filled and which are optional. Thus any entity can browse the ontology to learn the schema and query formats supported by the searchable component. They can then frame their query and get the results. We also generate search interfaces based on the schema which humans can use to enter queries. This greatly speeds development time, since each component that allows searches need not have a separate GUI for users. Instead, all they have to do is to specify their schema in an ontology the schema is then used to automatically generate the interface. These ontology-driven user interfaces makes query formulation easier. The user cant make a mistake by, say, using unknown terms. All available attributes and fillers are automatically loaded and presented dynamically depending on the query-template specified in the ontology. The user frames his query by just choosing reasonable values for the given attributes. For example, the MP3 Server supports searches based on attributes like name of song, genre of song, length of song, etc. This schema is described in the Ontology. Other agent can, thus, get the schema from the Ontology Server and send queries to the MP3 Server. Users can also send queries to the MP3 Server using the Ontology Explorer. The Ontology Explorer gets the schema from the Ontology Server and generates a dialog (based on the schema) where the user can enter the query. For example, the user can search for all songs by Elvis Presley. The Ontology Explorer submits the query to the MP3 Server and displays the results for the user. More details about how the Ontology Explorer is used to let users perform searches as well as screenshots can be found in the Implementation section. Similarly, automated agents can also make use of the search schemas defined in the ontology to frame queries to other entities and get the results. This smoothens the interactions between different entities. A more difficult problem is to provide context-sensitive queries and responses: the user frames the request in the vocabulary of his application task and context, but this may not match the vocabulary of the system. It will be necessary to translate requests to equivalent vocabularies, and to translate responses to the vocabulary of the consumer. In general, such translations are very difficult and cannot be done automatically. But when translations are known (e.g., between two standard vocabularies), ontologies can be used to automatically transform queries and responses. 4.3.3. Allowing Easier Interaction With Components Search is just one of the activities that users and computer programs can perform on various components in a pervasive environment. Different components allow different types of actions to be performed on them. For example, a music player allows different commands to be send to it start, stop, pause, change volume, etc. In our framework, components specify the commands they support and the parameters of these commands in an ontology. Thus, other entities can learn what commands can be sent to a particular component and can thus easily interact with this component. As in the case of search, we can easily generate GUIs where users can specify commands to be sent to a particular component. The ontology, thus, provides a generic way of interacting with different agents. The ontology describes the different commands that can be sent to an agent. For each command, it also describes what arguments or parameters are needed. Other agents, as well as users, can thus send these commands with the correct parameters to the agent. The Ontology Explorer also allows users to send commands to different agents. For example, the MP3 Server supports commands like play, stop, pause, increase volume, etc. If the user wants to send a command to this MP3 Server, the Ontology Explorer opens up a dialog that lists the commands available. Once the user chooses a command, it gets the list of required parameters for the command from the Ontology Server and allows the user to fill in these parameters. For example, if the user chooses the play command, the Ontology Explorer discovers that the play command needs one parameter the name of the song. It then presents the user with a list of songs (obtained from the MP3 Server) and allows the user to either choose a song or enter the location of a new song. It then sends the play command to the MP3 Server. More details about how the Ontology Explorer is used to let users send commands as well as screenshots can be found in the Implementation section. Similarly, automated agents can also make use of the commands defined in the ontology to send commands to other entities. This smoothens the interactions between different entities. Specifying Rules for Context-Sensitive Behavior A key feature of applications in pervasive computing environments is that they are context-aware, i.e. they are able to obtain the current context and adapt their behavior to different situations. For example, a music player application in a smart room may automatically play a different song depending on who is in the room and it may decide the volume of the song depending on the time of day. Gaia allows application developers to specify different behaviors of their applications for different contexts. We use ontologies to make it easier for developers to specify context-sensitive behavior. Context-aware applications in Gaia have rules that describe what actions should be taken in different contexts. An example of a rule is : IF Location(Manuel, Entering, Room 2401) AND Time(morning) THEN play a rock song. A rule consists of a condition, which if satisfied, leads to a certain action being performed. The condition is a Boolean expression consisting of predicates based on context information. In order to write such a rule, an application developer must know the different kinds of contexts available as well as possible actions that can be taken by the application. We have ontologies that describe the different kinds of context information location, time, temperature, activities of people, etc. We also have ontologies that describe different applications and what commands can be sent to them. The ontologies greatly simplify the task of writing rules. We have a GUI which allows developers to write rules easily. The GUI allows him to construct conditions out of the various possible types of contexts available. It then allows him to choose the action to be performed at these contexts from the list of possible commands that can be sent to this application as described in the ontology. Developers can, thus, very quickly, impart context-sensitivity to applications. Implementation Details We have integrated the use of ontologies in our smart spaces framework, Gaia. All the ontologies in Gaia are maintained by an Ontology Server. Other entities in Gaia contact the Ontology Server to get descriptions of entities in the environment, meta-information about context or definitions of various terms used in Gaia. It is also possible to support semantic queries (for instance, classification of individuals or subsumption of concepts). Such semantic queries require the use of a reasoning engine that uses description logics like the FaCT reasoning engine. We plan to provide support for such queries in the near future. One of the key benefits in using ontologies is that it aids interaction between users and the environment. With that aim in mind, we have developed an Ontology Explorer which allows users to browse and search the ontologies in the space. The Ontology Explorer also allows users to interact with other entities in the space through it. The interaction with other entities is governed by their properties as defined in the ontology. The Ontology Server The Ontology Service is a CORBA service maintains a single, cumulative current ontology for an Active Space. Each Active Space has one Ontology Server running in it.. As described above, the ontology is a logical schema for all the entities of the system. The Ontology Service implements algorithms to load and validate ontologies from DAML+OIL XML files, compose ontologies into a combined system ontology, and serve logical queries to a Knowledge Base (KB) representing the dynamically composed ontology  ADDIN ENRfu [34].  REF _Ref29459605 Figure 4 shows the key components of the Ontology Service. The service has a CORBA interface, and two main components: The Ontology Server, which implements the interface, maintains the current ontology and other state information, and executes the algorithms defined in the previous section. The OntoKB, a private class which is a generic wrapper for the logic engine and KB. The Ontology Service interface uses DAML+OIL XML documents to define ontologies and individual objects (as well-formed fragments of ontologies). The interface also uses Service Types, Service Offers, and Properties from the CORBA Trading Service package, CosTrading, and CosTradingRepos. The Ontology Service interface uses only open, public objects and formats, hiding the details of the data structures, logic engine, and KB. This makes it possible to substitute alternative implementations of the ontology data structures, logic engine, and KB.  Figure  SEQ Figure \* ARABIC 4. Overview of the OntologyService. In this implementation, the KB managed by the Ontology Server only has class information. In other words, the KB only has information about the types or classes of different entities or terms, not descriptions of actual instances of entities (i.e., the current state of the system). This class information is sufficient for carrying out most of the tasks we are interested in (which will be described in the following sections). A KB of description of instances would be far more dynamic than description of classes. Since instances can enter and leave the environment at any time, the knowledge base may have to be continuously updated to keep it in sync with the space. Also, there potentially may be a very large number of instances of entities. Also, managing a KB of instances also requires a naming scheme so instances can be reliably recognized and distinguished, and will need robust error handling and recovery. Furthermore, information about existing entities is managed by other components of GAIA, so it is not necessary to put this information in the KB. GAIA has a service called the Space Repository which maintains information about the entities in the space at any time. Each entity has an XML description which is written in accordance to the meta-information about the entity as described in the ontology. The Space Repository maintains the descriptions of all entities that are currently in the space. More details about the Space Repository can be found in  ADDIN ENRfu [52]. Instances of context information are distributed among different sensors and other entities that use context. The CORBA Trading Service uses the Ontology Server to get descriptions of different Service Types. The ontologies, thus, provide a semantic grounding of different service offers. Different services in the system advertise Service Offers with the Trading Service. The Service Offers are based on the Service Types that are defined in the Ontology. This arrangement allows partial semantic matching to the extent that all queries and offers are based on service types defined in an ontology. 5.2. Integration into GAIA Framework The Ontology Server has been integrated into the GAIA framework.  REF _Ref29459782 Figure 5 shows the interaction of the Ontology Service, GAIA entities, and the Ontology Browser. The Ontology Server has access to the ontologies described in Section 3. These ontologies are loaded into the Ontology Server when it is started. The Ontology Server also asserts the concepts described in the ontologies in the FaCT Reasoning Engine to make sure that they are logically consistent. It registers with the CORBA Naming Service so that it can be discovered by other entities in the environment. Other entities in the environment can query the Ontology Server to get descriptions and properties of classes. The Ontology Explorer supports queries like getting properties of other entities, definitions of terms, descriptions of different types of contextual information. Since the Ontology Server is a CORBA Object, it is easy for other CORBA-Based entities to get a reference to it from the CORBA Naming Service and then interact with it.  SHAPE \* MERGEFORMAT  Figure  SEQ Figure \* ARABIC 5. One of the key benefits in using ontologies is that it aids interaction between users and the environment. With that aim in mind, we have developed an Ontology Explorer which allows users to browse and search the ontologies in the space. The Ontology Explorer also allows users to interact with other entities in the space through it. The interaction with other entities is governed by their properties as defined in the ontology. The Ontology Explorer GUI allows searching the ontology and interacting with different entities in the environment with the help of the ontology. It can perform a keyword based search on all the classes and properties in the ontology. The user can then browse the results returned for example, he can get documentation about the classes returned, get properties of the class, etc. He can also get instances of the class. This is done by contacting a repository that maintains information about the instances of the class of entities.  Figure  SEQ Figure \* ARABIC 6. If instances of the class support searches (for example, if they are databases), he can enter queries that are sent to the instance and the results are then displayed. To support such searches, the Ontology Search Engine gets the schema for searching the instance from the Ontology Server and generates a GUI where the user can enter values for the query. For example. Some entities support commands being sent to them. The Explorer gets the type of commands that an entity supports as well the parameters for these commands from the Ontology Server. It then displays a GUI where the user can frame his command and send it for execution to the entity. For example, the MP3 Server supports various commands like Play, Pause, Stop, etc. The GUI below shows how a command can be sent to the MP3Server. The user can choose the command he wants to send from a list of available commands. Once he chooses the command (say Play), the Ontology Explorer queries the Ontology Server to see if this command requires any parameters, and if it does what kind of values should those parameters be. In the example below, the Play command has been defined to require one parameter the name of the song. So, the Ontology Explorer asks the MP3 Server for a list of songs in its database; it then displays the list of songs to the user and the user can choose the song he wants to play.  Figure  SEQ Figure \* ARABIC 7.  Figure  SEQ Figure \* ARABIC 8 The GUI was developed using C++, and it uses CORBA to communicate with other entities in Gaia. Related Work Object registries, such as the CORBA Naming Service, provide a basic mechanism for finding well-known (i.e., known in advance) services. Brokers, such as the CORBA Trader Service, provide the capability to locate services by attributes. Many other services provide similar features, including LDAP  ADDIN ENRfu [77], JINI  ADDIN ENRfu [12], and Microsofts Registry  ADDIN ENRfu [46] and .NET  ADDIN ENRfu [25]. In other work, the technology described in this report was applied to the standard CORBA Trading Service to enhance the service with the advantages of a Knowledge Base (KB)  ADDIN ENRfu [34]. The same idea can be applied to other CORBA registries, and other systems, such as JINI  ADDIN ENRfu [12] or .NET  ADDIN ENRfu [25]. For example, Chakraborty et al. report an augmented JINI registry, Dreggie, which is similar to our approach  ADDIN ENRfu [6]. {To do: Discussion of Web Services, .NET, etc.} A lot of work has been done in the area of context-aware computing in the past few years. However, not much effort has been spent in developing ontologies for context information. Seminal work has been done by Anind Dey, et al. in defining context-aware computing, identifying what kind of support was required for building context aware applications and developing an infrastructure that enabled rapid prototyping of context-aware applications  ADDIN ENRfu [10, 11]. While the Context Toolkit does provide a starting point for applications to make use of contextual information, it does not provide much help in organizing the wide range of possible contexts in some structured format. It also doesnt provide ways of defining the different kinds of contexts available to applications. Ontologies have been used in Multi-Agent Systems. MyCampus  ADDIN ENRfu [54], which is an agent-based environment for context-aware mobile services uses ontologies for describing contextual attributes, user preferences and web services, making it easy to accomodate new task-specific agents and web services. It, however, does not make use of reasoning mechanisms to ensure logical consistency of the ontologies. Rcal  ADDIN ENRfu [49] is a Distributed Meeting Scheduling software that negotiates meeting times based on user's availability and preferences. RCal can reason about schedules published on semantic web (written in RDF, based on some ontology) and automatically incorporate them in user's schedules. The RETSINA Multi-Agent System Infrastructure  ADDIN ENRfu [58] uses ontologies based on WordNet to enable mappings between similar words or synonyms. This allows agents to communicate with each other more effectively. Tamma, et al.  ADDIN ENRfu [59] describes the use of ontologies to enable automated negotiation between agents. The ontologies used describe various terms used in the negotiation process. Future Work Semantic interoperability between different environments Different pervasive environments use their own set of ontologies. So, to enable entities in two different environments need to interact with each other, we need to establish some common semantic ground to enable correct interaction. This common semantic ground takes the form of a shared ontology that includes concepts in the ontologies of both the environments along with bridge concepts that relate concepts in the two sets of ontologies together. Pervasive environments are inherently very dynamic and need to support mobility of entities. Thus, new entities can enter or leave these environments at any time. If the entities use different ontologies to describe their concepts, they make use of axioms which describe how concepts in one ontology are related to concepts in the other ontology. This allows new entities to enter the environment and take part in it seamlessly. One way of tackling the problem is by using a shared upper ontology under which other ontologies can be attached. This will require improved Knowledge Engineering environments, which is an area of active research  ADDIN ENRfu [13, 14, 35, 36, 57]. This study has shown that the Semantic Web technology can be used with CORBA to solve some problems for a ubicomp system, especially the description of objects and relationships. This study used the relatively rare approach of defining separate description classes. This approach has been shown to be feasible, but requires additional research. The definition of separate description classesindeed, whole parallel hierarchies of classesis complex and requires special processing by the software. The Ontology Service interface requires and explicit declaration of the link between a class and its description class. This approach should be standardized, perhaps with the addition of new standard tags in the DAML language. The OILed tool and other similar tools (such as Protg  ADDIN ENRfu [41]) simplify the creation of an ontology. However, the deciding the contents of an ontology is still Knowledge Engineering, and even simple concepts can be represented more than one way. While this may not matter for a self-contained system, relatively minor differences in expression of the same concept can make two ontologies difficult to use together. For example, consider the concept of a Web page which is identified by a URL. This can be modeled several ways, such as: Class URL type:string Class WebPage type: text url_of: URLor, alternatively Class WebPage type: text URL:stringThese two definitions are essentially the same, but are very difficult to map to each other. It would be very useful to define standards, patterns, and tools for creating standard interoperable ontologies. Due to limitations of time and the specific software used, this study failed to show some of the claimed advantages of the Description Logic based Semantic Web technology. These questions remain open for future studies. Description Logics can be useful for vocabulary mappingtranslating similar concepts with different names (e.g.,  ADDIN ENRfu [31, 55, 57]). For example, consider the ontology for MP3 files, which might be defined to have properties artist, label, and so on. In a library, the MP3 file would be a sub-class of library resource (e.g., the Dublin Core standard  ADDIN ENRfu [60]), with properties creator, publisher, and so on. It is likely that we would like to declare that our MP3 class is equivalent to the appropriate library resource, and that the property MP3.artist is equivalent to dc.creator, MP3.label is equivalent to dc.publisher, and so on. These relations can be asserted as DAML axioms. For example, the MP3 class from the GAIA ontology can be declared to be the same class as Recording from the library ontology: A more complex declaration could declare the logical equivalence of the properties. DAML+OIL has proven to be quite useful, especially in combination with a programming interface. However, it seems clear that the DAML and the Description Logic underlying DAML are necessary but not sufficient for ubiquitous computing applications. Some implementation issues, such as namespaces, were discussed above. More fundamentally, Description Logics are not suited for some critical aspects of ubiquitous computing. Description Logic (DL) (also know as Terminological Logic) can reason about names, which can include objects and relations. DL does not deal with quantitative concepts; including order, quantity, time, or rates. Unfortunately, this kind of reasoning is essential to certain aspects of ubiquitous computing, including, for instance, Quality of Service management, resource scheduling, and location tracking. Future research should seek to extend DAML+OIL with additional logical models from spatial and temporal logic, geometry, and so on. This study did not consider security, privacy, or access control. Indeed, the Semantic Web as a whole is largely conceived as a completely open system, in which everything is published for everyone to see. It is far from clear how any sort of access control could or should be applied, e.g., to the information in an ontology or a KB. Reasoning engines such as FaCT typically cant enforce any security policies, and the DAML language has no facility to limit visibility other than protecting the file that contains the XML (i.e., at the URL level of granularity). This topic must be addressed in future research. Conclusion The so-called Semantic Web is a set of emerging technologies mostly adopted from earlier work on intelligent agents  ADDIN ENRfu [5, 67]. The essence of the Semantic Web is a set of technology-independent, open standards for the exchange of descriptions of entities and relationships  ADDIN ENRfu [13, 16, 24, 32, 37, 41] This includes XML-based languages and formal models for Knowledge Bases. While the Semantic Web was designed to enhance Web search and agents, it turns out to be well suited to the requirements of a ubicomp system. The DAML+OIL language adds the advantages of the XML standard: a universally parseable representation, a universal standard for namespaces, widely available software support across many platforms, and so on. These features are especially important for implementing multiple vocabularies (schemas) from autonomous sources: XML provides the critical interoperability that enables the publication and exchange of vocabularies. Again, the DAML+OIL language uses the mechanisms of XML to deliver well-defined logic programs. This study has shown the need for future work in several areas. A useful feature of ubiquitous computing environments is to have queries be context sensitive. In other words, if queries could be augmented with context information, then the results would be more useful for the person or entity making the query. In future work, we sill show how ontologies can be useful in defining what kinds of contexts can be augmented with different kinds of queries. The DAML+OIL language is inadequate in describing concepts that deal with time, space, quantities, probabilities and certain other concepts. It might be useful to extend DAML+OIL so that such concepts can also be described within the same umbrella as terminological hierarchies. At the same time, issues of performance and decidability come into play while developing extensions. One of the powerful points in favor of description logics is that it is completely decidable, even though it may be too simple and limited for some purposes. So, there is a case in favor of not extending DAML+OIL to help it keep these properties. Other languages and logics would then have to be used to describe concepts involving time, quantities or probabilities. These issues will require further research in the future. 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