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Title: A graphical XML query language based on ORA-SS
Authors: NI WEI
Keywords: XML, query, user interfaces, algebra
Issue Date: 13-Apr-2009
Citation: NI WEI (2009-04-13). A graphical XML query language based on ORA-SS. ScholarBank@NUS Repository.
Abstract: In this thesis, we propose an expressive user-friendly graphical XML query language, named as GLASS, to address the difficulty of representing and interpreting complex queries semantics via/from graphical notations. GLASS explicitly and correctly expresses both query conditions and result constructions even if rich semantics are concerned. To define the formal semantics of GLASS and support algebraic query optimization, a new algebra, called G-algebra, is proposed. G-algebra is designed to support rich data semantics and it includes various distinctive operators for both query condition and result construction, such as swap, merge and group. Moreover, for the rich data semantics that are not captured in DTD/XSD schemas which should be validated during XML data update, we derive a set of semantics constraints with respect to the ORA-SS schema, among which, some constraints such as the semantic dependency have not been discussed in existing validation works for XML updates.
Appears in Collections:Ph.D Theses (Open)

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