RE: returning nodes which have a specific child
> I'm relatively new to xsl and to be honest a lot of it seems > like a black art. I suspect you're looking at XSLT code and trying to reverse engineer the design principles of the language from that. Since you're the kind of person who feels a need to understand the concepts rather than learning by cut-and-paste, I think you'd benefit from reading a good book on the language. > Can you briefly describe what your > solution does? It describes three rules: Rule 1: By default, when you find a node, do a shallow copy of this node and process its attributes and children by applying these rules recursively. Rule 2: But if you find an element, don't copy it; just process its child elements by applying these rules recursively. Rule 3: But if you find an element that has a child element that has an attribute @name whose value is 'CONTENT', do the same as in Rule 1. The tricky bit here is the priorities of the rules. I think Michael's been a bit naughty here by giving rule 2 a priority of -0.4 and leaving the priority of the other rules unspecified. In fact, the rules for defaulting priority mean that rule 1 has a priority of -0.5, and rule 3 has a priority of +0.5. (Higher number means higher priority.) I would have given the rules explicit priorities of 1, 2, and 3 respectively to make this more readable. Michael has also taken a short-cut in that Rule 1 is a very commonly used "default rule" called the identity template, so he has re-used it; but in your case it's never used for element nodes, so it could be replaced by the simpler rule <xsl:template match="@*"> <xsl:copy/> </xsl:template> (I'm not sure why rule 3 is processing the attributes of an element and rule 2 isn't, but I didn't study your original problem.) Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay > > > > <xsl:stylesheet version="1.0" > > xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> > > > > <xsl:template match="@*|node()"><!-- identity template --> > > <xsl:copy> > > <xsl:apply-templates select="@*|node()"/> > > </xsl:copy> > > </xsl:template> > > > > <xsl:template match="*" priority="-0.4" ><!-- skip unwanted --> > > <xsl:apply-templates select="*"/> > > </xsl:template> > > > > <xsl:template match="*[*[@name='CONTENT']]" ><!-- keep wanted --> > > <xsl:copy> > > <xsl:apply-templates select="@*|node()"/> > > </xsl:copy> > > </xsl:template> > > > > </xsl:stylesheet> > > > > Michael Ludwig
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