S. Adali and R. Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. In Proc. Intl. Conference on Data Engineering, 1995. 21  Home/Search   Document Details and Download   Summary   Related Articles   Check

....Unfortunately, users are required to be familiar with standard terminology of the domain. In addition, users must query the databases using the Loom query language [19] which is not generally familiar and requires some understanding of the conceptual classes of the knowledge base. HERMES [35][2] also provides a mediated approach for integrating distributed information systems. Knowledge engineers define the domain mappings with a declarative, rule based language. A mediator compiler defines the semantic database integration to the system in an automated way. HERMES also provides a ....

S. Adali and R. Emery "A Uniform Framework for integrating Knowledge in Heterogeneous Knowledge Systems", Proceedings of the 11th International Conference on Data Engineering, IEEE Computer Society Press, 1995, pp. 513-521.

....have quite similar objectives as another agent b, but it can be also very busy in satisfying many requests, so b may prefer not to contact it for avoiding a long waiting time. Moreover, the problem of integrating heterogeneous knowledge bases has to be considered in order to implement cooperation [2, 1]. Many Multi Agent Systems (hereafter MASs) have been recently proposed in the literature. In particular, coopera This paper is a short version of the full report [3] tion is often considered as one of the key concepts of agent communities [5, 6, 7] Researchers in Intelligent Agent Systems ....

S. Adali, R. Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. In Proc. of the 12th IEEE International Conf. of Data Engineering, 1995.

....and SQL are used to represent queries over ontologies. Queries are routed by mediation and brokerage to specialized agents for data retrieval from distributed sources and for integration [NODI98] Several other projects are involved in heterogeneous information sources interoperability. HERMES [ADAL95] semantically integrates information sources with mediators (close to TSIMMIS ones) written in a rule based declarative language. COntext INterchange [GOH97] adopts the same approach to accommodate heterogeneous semantic contexts. InfoQuilt [SHAH98] extends the InfoHarness architecture to a ....

ADALI S. EMERY R. --- A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems, in Proceedings of the 11 th IEEE Intl. Conference of Data Engineering, March (1995).

....satisfying certain criteria and a second one for a picture showing a map of the corresponding location. This decomposition task can be of varying complexity and can generate a set of possible decompositions, based on the information about the underlying sources and the domain of interest [101, 102, 103, 44, 84, 28, 29, 30, 17, 19, 73, 74, 128, 2, 3, 4, 5]. Integrate the query with additional user information, if available. This could require asking first a profiling agent for the user profile, habits, rights and interests. e.g. if a user is looking for Web pages about a given topic, and the system knows that the user does not speak English, ....

....with the selected information source, if it has specific rights, and so on. INFSYS RR 1843 00 05 5 Select the information sources to be queried, using the meta knowledge about them and about the application domain to determine which of the sources contain relevant data to answer the query [101, 102, 103, 44, 84, 28, 29, 30, 4, 5, 17, 19, 73, 74, 128]. If possible, determine further preferred information sources to be queried. Create a query plan. Determine in which order sub queries are to be performed [101, 102, 103, 17, 19] on the basis of query decomposition, of the data available in every source and of preference over sources, in ....

[Article contains additional citation context not shown here]

S. Adali and R. Emery. A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems. In A. Chen and P. Yu, editors, Proceedings of the Eleventh Conference on Data Engineering, Mar. 1995.

....Focus on linguistic power rather than ease of specification or interactive application. In recent years there has been much effort on integration of data from heterogeneous data sources via middleware both in the industry and in academia (e.g. Garlic, TSIMMIS, Hermes, DISCO, webMethods, OnDisplay [6, 25, 3, 47, 50, 49]) These efforts do not typically address the issue of errors or inconsistencies in data, or of data transformations. Recently, Haas et al. have developed a tool to help users match the schema in these heterogeneous databases and construct a unified view [24] We intend to extend XYZ in a similar ....

S. Adali and R. Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. In Proc. Intl. Conference on Data Engineering, 1995.

....the first kind whereas Section 4 treats updates of the second kind. Section 5 discusses related work and Section 6 concludes the paper. 2 Preliminaries and Motivating Example 2. 1 Syntax and Semantics In this section, we will briefly describe the basic theory behind mediated systems proposed in [26, 39, 4, 5, 3]. Illustration is provided via the HERMES implementation. A domain, D, is an abstraction of databases and software packages and consists of three components: 1) a set, Sigma whose elements may be thought of as the data objects that are being manipulated by the package in question, 2) a set F ....

....unsolvable in D, where the reference to D will be eliminated if it is clear from context. The key idea behind a mediated system is that constraints provide the link to external sources, whether they be databases, object bases, or other knowledge sources. This idea is developed extensively in [26, 39, 4, 5, 3] and we do not elaborate on them here. For example in HERMES, a domain call is a syntactic expression of the form domainname : hdomainfunctioni(harg1; argni) where domainfunction is the name of the function, and harg1; argni are the arguments it takes. Intuitively, a domain call ....

S. Adali and R. Emery. (1994) A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems, to appear in Proceedings of ICDE.

....the source provides is done automatically. Binding patterns have been added to the framework in a natural manner. Many projects handle the integration of heterogeneous information sources in a mediator like architecture, but only few address the problem of how to write query translators. HERMES [2, 21] also uses a mediator language based on annotated logic. In contrast to KAMEL, the constraint part consists only of functions which the sources can process. So there is no difficulty in translating queries and all queries are guaranteed to be supported. This encoding hinders in building general ....

Sibel Adali and Ross Emery. An uniform framework for integrating knowledge in heterogenous knowledge systems. In 11th IEEE International Conference on Data Engineering, pages 513--521, Taipei, Taiwan, March 1995.

....into the mediator data model. In this paper we present KOMET, a shell for developing dedicated mediators by means of a declarative language. There are few projects which deal with information integration in a comparable generality. Closely related projects in this field of research are HERMES [AE95] and TSIMMIS [PGMU96] HERMES also uses annotated logic for the mediatory knowledge base, but uses a different approach for the query translation. Its rule rewriting approach requires much more a priori anticipation of the kind of queries that might occur. Only queries for which corresponding ....

S. Adali and R. Emery. A uniform framework for integrating knowledge in heterogenous knowledge systems. In Proc. 11th IEEE International Conference on Data Engineering, pages 513--521, Taipei, Taiwan, March 1995.

....updates of the first kind whereas Section 4 treats updates of the second kind. Section 5 discusses related work and Section 6 concludes the paper. 4 Chapter 1 2 PRELIMINARIES 2. 1 Syntax and Semantics In this section, we will briefly describe the basic theory behind mediated systems proposed in [17, 26, 3, 4, 2]. Illustration is provided via the HERMES implementation. A domain, D, is an abstraction of databases and software packages and consists of three components: 1) a set, Sigma whose elements may be thought of as the data objects that are being manipulated by the package in question, 2) a set F ....

S. Adali and R. Emery. (1994) A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems, to appear in Proceedings of ICDE. Mediated View Maintenance 23

....Yes Structured databases MRDSM LooselyCoupled FDBS INRIA, France [LMR90] Relational Yes Relational databases TSIMMIS Mediator System Stanford [PMU96] Object Exchange Model (OEM) No Semistructured or unstructured, dynamic HERMES Knowledge Amalgamation Mediator System Univ. of Maryland [AE95] Two Stage Entity Relationship No Knowledge bases, spatial and temporal reasoning systems Information Manifold Information Gathering Agent AT T Bell Labs [LRO96] Relational class hierarchies No Web based data sources Metadatabase Metadata Repository System Rensselaer Polytechnic [CC96] None (but ....

....is also like a loosely coupled FDBS, in that the component sources are highly autonomous. Two mediator systems are discussed in section III. In TSIMMIS [PMU96, PMW95] the focus is integrating sources that are unstructured or semi structured, i.e. that do not have a well defined schema. In HERMES [AE95], the focus is integrating knowledge bases and reasoning systems. 3. Description Logic Based Systems The Information Manifold is a description logic based approach, which uses AI planning techniques to solve queries over multiple web based information sources [LRO96B] This approach is similar ....

S. Adali and R. Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. Proc. of the Eleventh International Conference on Data Engineering, pp. 513-520, 1995.

....is not supported by a source. Such a method was developed for boolean queries in [9] In this paper, we propose a generic and customizable mechanism for arbitrary attributes, modifiers and connectives. The query transformation methods can be integrated into mediated systems like the Hermes system [4] by adding an information pooling capability that expands predefined resource queries to its possible (relaxed) rewritings at query execution time. The flexible interface approach discussed in this paper is implemented as a stand alone system in the I.SEE (Integrated SEarch Engine) project that ....

S. Adal and R. Emery. "A Uniform Framework For Integrating Knowledge In Heterogeneous Knowledge Systems", in Proc. of the Eleventh International Conference on Data Engineering, pp. 513 - 520.

....1 and 3. Hence, the annotation [0:7; f1; 3g] denotes the function f where f(i) 0.7 for i=1,3 and f(i) 0 otherwise. The ordering on this lattice is given as follows: f 1 f 2 iff for all r 2 R , f 1 (r) f 2 (r) where is the usual lessthan or equal to ordering on the reals. Adali and Emery [1] have shown that constraints can be viewed as proving that the output of an external program has certain characteristics when different parameters are input. In other words, we assume that for each external program, we have a different set of functions that return a set of objects, each of which ....

S. Adali and R. Emery. (1994) A Uniform Framework For Integrating Knowledge In Heterogeneous Knowledge Systems, To appear in Proc. of the Eleventh International Conference on Data Engineering. (http://www.cs.umd.edu/projects/hermes/ publications/postscripts/cons.ps)

....on experiments comparing the use of caching with and without invariants, as well as the use of the DCSM, lossy and lossless compression schemes. Note that HERMES uses a logic based language extended with special constructs to access external software. The details of the language can be found in [5, 28]. In HERMES, external programs are referred to as domains and they are viewed as black boxes that allow certain operations to be performed by outside sources. These operations are executed via domain calls of the form d:f where d is the name of the domain and f is a function name corresponding to ....

S. Adali and R. Emery. (1995) A Uniform Framework For Integrating Knowledge In Heterogeneous Knowledge Systems, Proc. of the Eleventh International Conference on Data Engineering, pp. 513520. (http://www.cs.umd.edu/projects/hermes/ publications /abstracts/cons.ps)

No context found.

S. Adali and R. Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. In Proc. Intl. Conference on Data Engineering, 1995. 21

No context found.

Sibel Adali and Ross Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. In Eleventh International Conference on Data Engineering, pages 513-520, March 1995.

No context found.

Sibel Adali and Ross Emery. A uniform framework for integrating knowledge in heterogeneous knowledge systems. In Eleventh International Conference on Data Engineering, pages 513-520, March 1995.

No context found.

S. Adali and R. Emery. A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems. In P. S. Yu and A. L. P. Chen, editors, Proceedings of the Eleventh International Conference on Data Engineering, pages 513-520, Taipei, Taiwan, March 1995. IEEE Computer Society.

No context found.

S. Adali and R. Emery. A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems. In P. S. Yu and A. L. P. Chen, editors, Proceedings of the Eleventh International Conference on Data Engineering, pages 513--520, Taipei, Taiwan, March 1995. IEEE Computer Society.

No context found.

S. Adali and R. Emery. A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems. In P. S. Yu and A. L. P. Chen, editors, Proceedings of the Eleventh International Conference on Data Engineering, pages 513--520, Taipei, Taiwan, March 1995. IEEE Computer Society.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC