Subject: Re: [xsl] (or) statement in setting node-set variable From: Mike Brown <mike@xxxxxxxx> Date: Fri, 5 Jan 2001 17:47:12 -0700 (MST) |
Keith wrote: > On several occasions I have established a variable by selecting a child > element with an OR statement, > (eg. <xsl:variable name="NAME" select="//merchantName|//pocName"/>) I can't help with the question, but I can tell you that | is not OR. It is a union operator. So the expression is not evaluated as "the set of nodes matching pattern //merchantname or //pocName" Instead, it is evaluated as "the node-set that is the union of node-set x and node-set y, where node-set x is the set of nodes matching pattern //merchantName and node-set y is the set of nodes matching pattern //pocName" This subtle distinction can be important to understand from time to time. If | really meant logical OR, the expression would be equivalent to boolean(//merchantName) or boolean(//pocName) and would return a boolean rather than a node-set. The only real logical OR is the token 'or'. - Mike ____________________________________________________________________ Mike J. Brown, software engineer at My XML/XSL resources: webb.net in Denver, Colorado, USA http://skew.org/xml/ XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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