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URL:
http://www.w3.org/XML/Query
This document proposes a query language syntax for
XML documents, called XQuery. Such a query language has quite different
requirements than traditional languages; much more different than is commonly
appreciated. Many past proposals have taken a basically relational query
language (typically SQL), and modified it by the addition of a few constructs:
typically a "contains" operator and some features for matching
strings within text chunks against regular expressions, or against word-roots.
Such features, while needed, are not enough. The hard problem arises because
the most basic design principles of relational databases,
do not hold for XML documents.
Keywords:
Computational VP, Limited usage
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