Re: XSLT - update attribute with new value

you can't have top level variable and parameters of the same name
    <xsl:variable name="attr" select="deployment-version"/>
        <xsl:variable name="value" select='TEST'/>
<xsl:param name="attr"/>
<xsl:param name="value"/>

$value couldn't refer to both the parameter and the variable of that
name. Your XSLT processor should have stopped at that point and not
produced any output.

running saxon 6.5 on your posted stylesheet produces

$ saxon value.xml value.xsl
Error at xsl:variable on line 5 of file:/c:/tmp/value.xsl:
  Duplicate global variable declaration
Error at xsl:variable on line 6 of file:/c:/tmp/value.xsl:
  Duplicate global variable declaration
Error at xsl:param on line 7 of file:/c:/tmp/value.xsl:
  Duplicate global variable declaration
Error at xsl:param on line 8 of file:/c:/tmp/value.xsl:
  Duplicate global variable declaration
Transformation failed: Failed to compile stylesheet. 4 errors detected.

If your XSLT processor didn't do that I'd consider switching processors,
at least for development purposes so you get helpful error messages.

If you delete the spurious variable declarations

 <xsl:variable name="attr" select="deployment-version"/>
        <xsl:variable name="value" select='TEST'/>

and change
   <xsl:output indent="yes" method="xml"/>

to
   <xsl:output indent="no" method="xml"/>
(indenting always messes up an identity transform, by design)

Then running it on in input:

<a a="z">
 <b deployment-version="222"/>
 <c/>
</a>


 you get


$ saxon value.xml value.xsl
<?xml version="1.0" encoding="utf-8"?><a a="z">
 <b deployment-version="222"/>
 <c/>
</a>

and if you supply a parameter:

$ saxon value.xml value.xsl  attr=deployment-version value=voila
<?xml version="1.0" encoding="utf-8"?><a a="z">
 <b deployment-version="voila"/>
 <c/>
</a>

David

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