Subject: [xsl] Testing by counting or positional predicate From: Jeni Tennison <mail@xxxxxxxxxxxxxxxx> Date: Thu, 11 Jan 2001 11:51:03 +0000 |
David C. and I have both brought this up recently, but hidden away in the depths of other messages and I don't think anyone has commented on it. So, I was wondering: which is more efficient for testing whether a $subset node set is a subset of a $superset node set? count($subset|$superset) = count($superset) or: not(($subset|$superset)[count($superset) + 1]) Does it make any difference if the $subset is just one node? count($node|$node-set) = count($node-set) or: not(($node|$node-set)[count($node-set) + 1]) Does this extend to testing for identity or is the unioned set so small that it doesn't make any odds? count($node1|$node2) = 1 or: not(($node1|$node2)[2]) Thanks, Jeni --- Jeni Tennison http://www.jenitennison.com/ XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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