X. Qian and T. Lunt. Semantic interoperation: A query mediation approach. Technical Report TR 94-02, SRI International, 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... may be classified as follows: those advocating a unified global schema [1, 2, 9, 17, 18] those requiring the use of a higher order language or logic or a meta model [28, 3, 7, 15, 20, 21] and those advocating a federated approach or a mapping approach based on a canonical representation [4, 8, 9, 19, 22, 24, 25, 26, 27]. We will compare our research with these projects in section 6. Mediators resolve conflicts so that data from multiple information sources can be integrated. The KIF Mediator has knowledge about the semantics of the multiple object databases in the KIF formalism and can reason about the ....

Qian, X. and Lunt, T. "Semantic Interoperation: A Query Mediation Approach," Technical Report SRI-CSL-94-02, Computer Science Laboratory, SRI International, 1994. 15

....combine this physically dispersed information. Moreover, the information developed independently at separate sites in a distributed database has data that varies in both syntax and semantics. These forces lead to the need for mediation of query and information exchange between different databases [QL94] The variety of discrepancies that must be mediated has been well documented such as in [SPD92] Many solutions to this problem have been proposed, most based on the notion of schema integration [CGH 94] When the data at different sites are sufficiently closely related, such a simple ....

Xiaolei Qian and T.F. Lunt. Semantic interoperation: A query mediation approach. Technical Report 02, Computer Science Laboratory, SRI International, April 1994.

....generalize to arbitrary fixed spatial (or temporal) dimensions. Extensibility. Application dependent interoperability issues of resolving semantic and representational mismatches and conflict detection and resolution have found a very elegant formulation using the language of first order logic [QL94] Thus, solutions to these problems can be seamlessly integrated with the techniques we propose for the translation between different data models. The problem of incomplete information can also be addressed in the same framework. ....

X. Qian and T.F. Lunt. Semantic Interoperation: A Query Mediation Approach. Technical Report SRI-CSL-94-02, Computer Science Laboratory, SRI International, April 1994.

....generalize to arbitrary fixed spatial (or temporal) dimensions. Extensibility. Application dependent interoperability issues of resolving semantic and representational mismatches and conflict detection and resolution have found a very elegant formulation using the language of first order logic [QL94] Thus, solutions to these problems can be seamlessly integrated with the techniques we propose for the translation between different data models. The problem of incomplete information can also be addressed in the same framework. ....

X. Qian and T.F. Lunt. Semantic Interoperation: A Query Mediation Approach. Technical Report SRI-CSL-94-02, Computer Science Laboratory, SRI International, April 1994.

....2 (L 2 ) R2 ; L1 ; N1 ; f1) L2 ; N2 ; f2) ATTR(R2 ) OE, N1 = 2 ATTR(R2 ) N2 = 2 ATTR(R1 ) N1 6= N2 , N2 = 2 L2 . Table 2. Transformation Rules for pad, rename and deriveAttr in AURORA is based on MEAs which provide operators specially designed for handling data from heterogeneous sources. [15] and [4] present intelligent mediation techniques that detect and resolve semantic heterogeneities automatically by reasoning about semantics in a knowledge base or ontology. In AURORA, such tasks are performed by a mediator author using MATs. Once established, intelligent mediation techniques can ....

X. Qian and T. F. Lunt. Semantic Interoperation: A Query Mediation Approach. Technical Report SRI-CSL-94-02, Computer Science Laboratory, SRI International, Apr. 1994.

....Databases Introduction and Comparison with Related Research 4 to relational, deductive and object oriented data models. Although the goals of these researchers are different, they provide insight into knowledge that is relevant to the query transformation process. Lefebvre et al. 1992) and Qian (1993, 1994) approach this problem from different viewpoints. Lefebvre et al. 1992) consider the problem of interoperable query processing among multiple relational schemas. F logic, a higher order logic, is used to express the mapping information among relational schemas and to express the algorithm ....

....from different viewpoints. Lefebvre et al. 1992) consider the problem of interoperable query processing among multiple relational schemas. F logic, a higher order logic, is used to express the mapping information among relational schemas and to express the algorithm for query transformation. Qian (1993) suggests that a language which has minimal representation bias may express mismatch in representation among heterogeneous schema. The paper uses a first order theory to represent mapping knowledge among different relational schemas; it also uses a theorem proving approach rather than a ....

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Qian, X. and Lunt, T.F. (1993) "Semantic interoperation: a query mediation approach," Computer Science Laboratory, SRI International, Technical Report.

....conflicts, structural and scaling differences, non empty symmetric differences in data content, differences in scope or level of abstraction, and differing data models (e.g. object oriented vs. relational. 2 Model Description Our model consists of two components. First, we introduce a mediator [6], an object oriented graph, which is used to arbitrate between the local schemas by deciding upon the subqueries. Second, we introduce annotated links which relate the local and mediator concepts. For now, we assume the mediator and its links are made a priori when each individual schema was ....

Xiaolei Qian and T.F. Lunt. Semantic interoperation: A query mediation approach. Technical Report 02, Computer Science Laboratory, SRI International, April 1994.

....Conference on Information Security (SEC 98) Vienna Budapest, 31 August 2 September , 1998 [8] 2 based on mediation do not require the speci cation and management of a federated schema or multidatabase language. They therefore remove previous impediments to true interoperation and automation [19]. The interest in and success of mediated architectures is witnessed by a large number of research projects and prototypes under development (e.g. 17, 4, 14] Most attention has been devoted, however, to data and query management issues in interoperation, while less attention has been devoted ....

X. Qian and T. Lunt. Semantic interoperation: A query mediation approach. Technical Report TR 94-02, SRI International, 1994.

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Qian, X., and T.F. Lunt (1994). Semantic Interoperation: A Query Mediation Approach, Technical Report SRI-CSL-94-02, Computer Science Laboratory, SRI International.

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