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Subject: RE: [xsl] Apply-templates - how to omit top level element tags? From: "Mike Schinkel" <mikes@xxxxxxxxx> Date: Thu, 8 Sep 2005 18:38:03 -0400 |
>> XSLT variables always have the same value once bound Sorry, I didn't mean "variable" in the literal sense, I meant 'something' changing, not necessarily literally a variable. For example, you can insert a template that takes otherwise tested and working code and it totally screws up the output, and there's no way to guard against that happening (at least as far as I can see.) Case in point, the following two examples where the first only differs from the second by inclusion of this one line template: <xsl:template match="Name"> <xsl:apply-templates/> <!-- THIS CHANGES EVERYTHING! --> </xsl:template> ===[Example 1]============================================== <?xml version="1.0" encoding="utf-8" standalone="no"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";> <xsl:output method="html"/> <xsl:variable name="trademark-symbol">™</xsl:variable> <xsl:template match="@*|node()"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> <xsl:template match="Trademark"> <xsl:value-of select="$trademark-symbol"/> </xsl:template> <xsl:template match="/How-To-Select/Guide"> <html> <head><title>Test</title></head> <body> <h1> <!-- THIS DIDN'T WORK - INCLUDE <Name/> TAGS --> <xsl:apply-templates select="Name"/> </h1> <h1> <!-- THIS DIDN'T WORK - OMITS Trademark Symbol --> <xsl:value-of select="Name"/> </h1> <h1> <!-- THIS DIDN'T WORK - INCLUDES <Name/>, <Trademark/>, DOES NOT EXPAND <Trademark/> --> <xsl:copy-of select="Name"/> </h1> <h1> <!-- THIS IS WHAT I NEEDED --> <xsl:apply-templates select="Name/node()"/> </h1> This is some more text just for show. </body> </html> </xsl:template> </xsl:stylesheet> ===[Example 2]============================================== <?xml version="1.0" encoding="utf-8" standalone="no"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";> <xsl:output method="html"/> <xsl:variable name="trademark-symbol">™</xsl:variable> <xsl:template match="@*|node()"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> <xsl:template match="Trademark"> <xsl:value-of select="$trademark-symbol"/> </xsl:template> <xsl:template match="Name"> <xsl:apply-templates/> <!-- THIS CHANGES EVERYTHING! --> </xsl:template> <xsl:template match="/How-To-Select/Guide"> <html> <head><title>Test</title></head> <body> <h1> <!-- THIS DIDN'T WORK - INCLUDE <Name/> TAGS --> <xsl:apply-templates select="Name"/> </h1> <h1> <!-- THIS DIDN'T WORK - OMITS Trademark Symbol --> <xsl:value-of select="Name"/> </h1> <h1> <!-- THIS DIDN'T WORK - INCLUDES <Name/>, <Trademark/>, DOES NOT EXPAND <Trademark/> --> <xsl:copy-of select="Name"/> </h1> <h1> <!-- THIS IS WHAT I NEEDED --> <xsl:apply-templates select="Name/node()"/> </h1> This is some more text just for show. </body> </html> </xsl:template> </xsl:stylesheet> ============================================================ -Mike -----Original Message----- From: David Carlisle [mailto:davidc@xxxxxxxxx] Sent: Thursday, September 08, 2005 6:13 PM To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx Subject: Re: [xsl] Apply-templates - how to omit top level element tags? > Yes, but I don't have to worry about a global variable changing and > having a tested part of my encapsulated code no longer work. I have > seen that happen many times when building my stylesheet, and can find > nothing that changes this. XSLT variables always have the same value once bound, people coming from imperative programming languages sometimes expect that they should be able to "change" the variable's value, which you can't do. You are the first person I've seen that has complained that variables _do_ change value. That never happens in XSLT.Some other problemmust be causing the effect you see, if you posted a small example... David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________
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