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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Variable in XPath
 see my comments: Garvin Riensche wrote: Hello, ? <xsl:variable name="id" select="attribute::*"/> Why a variable? You wanted to set it externally, in which case you better use a parameter. Seems that you want the variable to hold the value of the current attribute by default? This only works when there's a context item, and there is no context item on the root level of a stylesheet, so this effectively means that your variable contains the empty sequence. You could provide an absolute xpath, but then you would loose the context. I suppose this is cleaner instead and gives you all you need: <xsl:param name="id" />
It is best practice (most of the time) *not* to use // in a match clause, it serves no purpose.
$id = (2, 3) and if $id is not set at all. assuming 'and' is semantically 'or' here (because $id = (2, 3) and empty($id) is never true): $id = (2,3) or empty($id) So, the key is the comparison "@id eq $id" and the default value of $id. ah, you meant something else?.... "attribute::*" as default value is obviously wrong. see above, it will give an empty sequence Which default value do I have to use to test if class nodes exist at all? I don't see why you want a default value for this, just don't use the $id: empty(facts/class) or, if you do some xsl:apply-templates, you probably don't have to worry about non-existing nodes at all (over-use of xsl:choose/when/if is a common cause of unstructured hard-to-maintain code): <xsl:apply-templates select="facts/class" /> will not select 'class' when there is none. Now that we put it all together, I assume you mean something like: if $id matches one or more @id, do something, if it matches none, but there are class-nodes, do something else, if there are no class-nodes, do something else. Here's one way to do it (in this case without xsl:choose, but you can of course use that if you feel more comfortable about it): <xsl:param name="id" /> <xsl:template match="your-start">
<xsl:apply-templates match="doc('factbase.xml')/facts/class" />
</xsl:template><xsl:template match="class[@id = $id]"> ...do your stuff with a matching $id=@id for class-nodes... </xsl:template> <xsl:template match="facts[not(class/@id = $id)]/class"> ...do your stuff when no @id matches the supplied $id, but class-nodes exist... </xsl:template> <xsl:template match="facts[empty(class)]"> ...do your stuff when there are no class-nodes... </xsl:template> Happy coding! Cheers, -- Abel Braaksma PS: alternatively, you could remove the second xsl:template match rule with the following, which reads easier and works equally well, because of priority rules: <xsl:template match="class"> ...do your stuff when no @id matches the supplied $id, but class-nodes exist... </xsl:template> 
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