Handling of current time in native XML databases

Authors:
Bela Stantic;Guido Governatori;Abdul Sattar
Affiliations:
Institute for Integrated and Intelligent Systems, Griffith University, Brisbane, Australia;School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, Australia;Institute for Integrated and Intelligent Systems, Griffith University, Brisbane, Australia
Venue:
ADC '06 Proceedings of the 17th Australasian Database Conference - Volume 49
Year:
2006

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Abstract

The introduction of Native XML databases opens many research questions related to the data models used to represent and manipulate data, including temporal data, in XML. Increasing use of XML for Valid Web pages warrants an adequate treatment of now in Native XML databases. In this study, we examined how to represent and manipulate now-relative temporal data. We identify different approaches being used to represent current time in XML temporal databases, and introduce the notion of storing variables such as 'now' or 'UC' as strings in XML native databases. All approaches are empirically evaluated on a query that time-slices the timeline at the current time. The experimental results indicate that the proposed extension offers several advantages over other approaches: better semantics, less storage space and better response time.