Subject: Re: [xsl] xsl:for-each...iteration question (XSLT 1.0solution) From: "Aron Bock" <aronbock@xxxxxxxxxxx> Date: Wed, 20 Apr 2005 18:40:17 +0000 |
From: "Paul Coletti" <pcoletti@xxxxxxxxxx> Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx> Subject: Re: [xsl] xsl:for-each...iteration question (XSLT 1.0solution) Date: Wed, 20 Apr 2005 09:43:41 +0200
Thanks to all the varied replies. I got a lot out of them.
I went for the one outlined by Jay Bryant below which did the trick. I guess this old assembler coder needs to start thinking in functional-programming terms....
>>> JBryant@xxxxxxxxx 19/04/2005 17:59:44 >>> Sorry to reply to my own post. I realized that you won't get a well-formed XML document with my original solution. Here's the fix:
<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:variable name="exclude" select="document('excludedoc.xml')"/>
<xsl:template match="modify"> <modify> <xsl:apply-templates/> </modify> </xsl:template>
<xsl:template match="modify-attr"> <xsl:variable name="name" select="@attr-name"/> <xsl:if test="not($exclude/exclude-list/exclude-attr[.=$name])"> <xsl:copy-of select="."/> </xsl:if> </xsl:template> </xsl:stylesheet>
Of course, you probably have a bunch of other templates to manage anyway, but I do like to have my answers produce well-formed output.
Re-tested with Saxon 8.4 Xalan-J 2.4.1.
Jay Bryant Bryant Communication Services (presently consulting at Synergistic Solution Technologies.
JBryant@xxxxxxxxx 04/19/2005 11:51 AM Please respond to xsl-list@xxxxxxxxxxxxxxxxxxxxxx
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Subject Re: [xsl] xsl:for-each...iteration question
My solution would go like this: At the top of the stylesheet, use the document function to write the exclude-attr elements into a variable (so that I only have to use the document function once). In the modify-attr template, see if the current node has a matching exclude-attr element (by examining the contents of that variable). If not, write the modify-attr element to the result.
So, I'd end up with this:
<?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:variable name="exclude" select="document('excludedoc.xml')"/>
<xsl:template match="modify-attr"> <xsl:variable name="name" select="@attr-name"/> <xsl:if test="not($exclude/exclude-list/exclude-attr[.=$name])"> <xsl:copy-of select="."/> </xsl:if> </xsl:template> </xsl:stylesheet>
Tested with Saxon 8.4 and Xalan-J 2.4.1.
Jay Bryant Bryant Communication Services (presently consulting at Synergistic Solution Technologies)
"Paul Coletti" <pcoletti@xxxxxxxxxx> 04/19/2005 11:19 AM Please respond to xsl-list@xxxxxxxxxxxxxxxxxxxxxx
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Subject [xsl] xsl:for-each...iteration question
This has been answered before I'm sure but doing a relevant search in the archives is tricky.
I've an input doc containing a number of modify-attr elements <modify> <modify-attr attr-name = "abc"/> <modify-attr attr-name = "123"/> <modify-attr attr-name = "789"/> </modify>
I have another document containing a list of prohibited attributes. <exclude-list> <exclude-attr>123</exclude-attr> </exclude-list>
I want to iterate over my input doc and copy all those modify-attr elements that are NOT in the exclude list to the output.
<xsl:template match="modify/modify-attr"> <xsl:variable name="currentAttr" select="@attr-name"/> <xsl:variable name="currentNode" select="."/>
<xsl:for-each select="document('excludedoc')/exclude-list/exclude-attr"> <xsl:when test="$currentAttr=."> <xsl:message>Exclude</xsl:message> </xsl:when> <xsl:otherwise> <xsl:copy-of select="$currentNode"/> </xsl:otherwise> </xsl:for-each>
</xsl:template>
Obvisouly, this is flawed, I get multiple modify-attr elements copied to the output because I cannot see a way of ensuring the for-each only copies
a permitted node once and once only.
I've a feeling this is approaching the problem from the wrong way....
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