11th International World Wide Web Conference (WWW 2002),
Honolulu, Hawaii,
May, 7-11,
2002.
CDROM/online at
http://www2002.org/CDROM/alternate/166/.
Querying Linked XML Document Networks in the Web
Wolfgang May
Abstract:
The W3C XML Linking Language (XLink) provides a powerful means for
interlinking XML documents all over the world. From the database
(and in general, querying) point of view, elements with linking
semantics as specified by XLink can be seen as embedded views in an
XML instance. Compared with classical databases, i.e., SQL and
relational data, the situation of having links inside the
data is new, raising new aspects for query languages: for using such
documents, strategies how to handle links are required. There is not
yet an official proposal on the interaction of interlinked XML
documents using the XLink language and navigation/querying. We
investigate a model where interlinked documents are regarded as
virtual XML subtrees, i.e., XML views. Several
strategies are presented how to handle such subtrees, concerning the
timepoint when the link is evaluated, and the evaluation and caching
strategies. The evaluation strategies are influenced by
capabilities of the linked XML servers. So far, the approach is
independent from the actual querying language. The approach is under
implementation as an extension of LoPiX, a
web-aware system for XML data manipulation.
[Slides (postscript)]
[Slides (pdf)]
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