Interschema Knowledge in Cooperative Information Systems
نویسندگان
چکیده
Managingin tersc hema knowledge isan essen tial taskwhen dealing withcoopera-tiv e information systems. W e prop osea logical approac h totheproblem ofboth expressing in tersc hema knowledge, and reasoning aboutit. Inparticular, we set up a logical language forexpressing seman tic in terdep endencies bet weenclasses belonging todifieren t database sc hemas,and sho w thatreasoning oversuc h in-terdep endencies isdecidable. Thisyields thepossibilit y ofbuilding a logic-based mo dule that candra w useful inferences whenev ertheneeds arises ofbothchec king coherence bet weentheknowledge represen tedindifieren tsc hemas, andcombining theresults ofa setofqueries referring todifieren t databases.
منابع مشابه
Representing and Using Interschema Knowledge in Cooperative Information Systems
Managing interschema knowledge is an essential task when dealing with cooperative information systems. We propose a logical approach to the problem of both expressing interschema knowledge, and reasoning about it. In particular, we set up a structured representation language for expressing semantic interdependencies between classes belonging to different database schemas, and present a method f...
متن کامل8 Conclusions
19 and complete calculus for DFOL based on ML systems. Finally we have compared our formalism with other formalisms for the representation and integration of distributed knowledge and reasoning systems. Acknowledgments. We thank all the people of the Mechanized Reasoning Group of IRST and DISA for useful discussions and feedback on the paper. We thank Massimo Benerecetti and Sergio Tessaris for...
متن کاملExtensional Knowledge for Semantic Query Optimization in a Mediator Based System
Query processing in global information systems integrating multiple heterogeneous sources is a challenging issue in relation to the effective extraction of information available on-line. In this paper we propose intelligent, tool-supported techniques for querying global information systems integrating both structured and semistructured data sources. The techniques have been developed in the env...
متن کاملAn Information Integration Framework for E-Commerce
because the storage systems lack structural and application homogeneity in addition to a common ontology. The semantic differences generated by a lack of consistent ontology can lead to conflicts that range from simple name contradictions (when companies use different names to indicate the same data concept) to structural incompatibilities (when companies use different models to represent the s...
متن کامل5 Related Work
12 integration, such as semantic heterogeneity, interschema dependencies, local control over data and processing and transparency. The major contributions of this paper are the following: First we have described motivating examples in federated databases and within each example we have pointed out its critical aspects. These aspects cover a large range of well known problems in the area of fede...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1993