Access to Objects by Path Expressions and Rules

Frohn, Jürgen ; Lausen, Georg ; Uphoff, Heinz

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URN: urn:nbn:de:bsz:180-madoc-8295
Document Type: Working paper
Year of publication: 1994
The title of a journal, publication series: None
Publication language: English
Institution: School of Business Informatics and Mathematics > Sonstige - Fakultät für Wirtschaftsinformatik und Wirtschaftsmathematik
MADOC publication series: Veröffentlichungen der Fakultät für Mathematik und Informatik > Institut für Informatik > Technical Reports
Subject: 004 Computer science, internet
Subject headings (SWD): Objektrelationales Datenbanksystem , Pfadalgorithmus
Abstract: Object oriented databases provide rich structuring capabilities to organize the objects being relevant for a given application. Due to the possible complexity of object structures, path expressions have become accepted as a concise syntactical means to reference objects. Even though known approaches to path expressions provide quite elegant access to objects, there seems to be still a need to extend the applicability of path expressions. The rule-language PathLog proposed in the current paper generalizes path expressions in several ways. PathLog adds a second dimension to path expressions which makes it possible to use only one path in situations where known one-dimensional path expressions require a conjunction of several paths. In addition, a path expression can also be used to reference virtual objects. This general use of path expressions gives rise to many interesting semantic implications.
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Das Dokument wird vom Publikationsserver der Universitätsbibliothek Mannheim bereitgestellt.

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