Download Journal on Data Semantics VII by Yuan An, Alex Borgida, John Mylopoulos (auth.), Stefano PDF

By Yuan An, Alex Borgida, John Mylopoulos (auth.), Stefano Spaccapietra (eds.)

The LNCS magazine on information Semantics is dedicated to the presentation of extraordinary paintings that, in a single means or one other, addresses learn and improvement on concerns on the topic of information semantics. in keeping with the hugely noticeable booklet platform Lecture Notes in laptop technological know-how, this new magazine is greatly disseminated and on hand worldwide.

The scope of the magazine levels from theories assisting the formal definition of semantic content material to leading edge domain-specific functions of semantic wisdom. The magazine addresses researchers and complex practitioners engaged on the semantic net, interoperability, cellular info prone, info warehousing, wisdom illustration and reasoning, conceptual database modeling, ontologies, and synthetic intelligence.

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An essential initial step is dealing with the fact that in the ontology (as in object oriented databases), objects have intrinsic identity, which is lost in the relational data model, where this notion is replaced by external identifiers/keys. For this purpose, the standard approach is to introduce special Skolem functions that generate these identifiers from the appropriate keys, as in: O:Employee(ff(ssn)) :- T :Employee(ssn, , , ). One then needs to express the external identifiers using axioms that relate these Skolem functions with the appropriate ontology attributes: O:hasSsn(ff(ssn),ssn) :- T :Employee(ssn, , , ).

Discovering the Semantics of Relational Tables Through Mappings 29 For example, the above formula is equivalent to the OWL concept: The algorithm for performing this translation in general, encodeTreeAsConcept(S), is almost identical to encodeTree, except that the recursive calls return OWL concepts Ci , which lead to conjuncts of the form restriction(pi , someValuesFrom(Ci )): Function encodeTreeAsConcept(S) input: subtree S of ontology graph output: abstract syntax of OWL concept logically equivalent to the FOL formula encodeTree(S, L) steps: Suppose N is the root of S.

Quillian. Semantic Memory. In Semantic Information Processing. Marvin Minsky (editor). 227-270. The MIT Press. 1968. 21. E. Rahm and P. A. Bernstein. A Survey of Approaches to Automatic Schema Matching. VLDB Journal, 10:334–350, 2001. 22. R. Ramakrishnan and M. Gehrke. ). McGraw Hill, 2002. 23. H. Wache, T. Vogele, U. Visser, H. Stuckenschmidt, G. Schuster, H. Neumann, and S. Hubner. Ontology-Based Integration of Information - A Survey of Existing Approaches. In IJCAI’01 Workshop. on Ontologies and Information Sharing, 2001.

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