XQuery 1.0/XPath 2.0 - simplifying predicate evaluation rules

• From: Howard Katz <howardk@fatdog.com>
• Date: Tue, 21 May 2002 19:19:17 -0400 (EDT)
• To: <public-qt-comments@w3.org>
• Message-ID: <NFBBKEMEJKFJGCPOOKHCAEFECHAA.howardk@fatdog.com>

Rule #4 under "2.3.2.1 Predicates" in both the XQuery 1.0 and XPath 2.0
documents seems needlessly awkward to me. The rule states,

4) "If the value of the predicate expression is a sequence that contains at
least one node and does not contain any item that is not a node, ..."

Rule #1) states, "If the value of the predicate expression is an empty
sequence, ...". Thus if we've gotten as far as #4, we already know we have a
non-empty sequence. So why not simply say something as straightforward as,

4) "If the value of the predicate expression is a purely homogeneous
sequence of nodes only, ..." or some such? I don't see any loss of technical
accuracy by doing so.

Best,
Howard

Received on Wednesday, 22 May 2002 03:56:50 UTC