Subject: RE: comments on XSLT draft 13 August 1999 From: Kay Michael <Michael.Kay@xxxxxxx> Date: Wed, 1 Sep 1999 10:53:13 +0100 |
> 10) 11.4 Top-level Variables and Parameters > Why not use the same visibility rules for top-level > variables and parameters as for template variables and parameters: they are > visible in following siblings and their descendents? Forcing XSLT processors to > handle forward references to other top-level variables and > parameters adds complexity without any functional benefit. Since circular > references are prohibited anyway, there must be some ordering that eliminates forward > references, so why not just prohibit forward references? > I agree strongly with this. The current ordering rules give me considerable problems. I have previously raised the comment (which is not addressed in the current draft) that the current rules don't handle other forms of circular reference, e.g. <variable name="index"> <apply-templates select="//record[last()]"/> </variable> <template match="record[number($index)]" priority="2">1</template> <template match="record">2</xsl:template> The simplest answer to this one is to ban calls on apply-templates and call-template within a global variable declaration. Circular references can also be caused by key definitions (a global variable uses a key, while the key definition uses the global variable) and by named attribute sets. A general principle of "no forwards references" could solve many of the problems at a stroke. Mike Kay XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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