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Subject:
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Apply a propertie file to a different xml file
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Posted By:
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Clyne
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Post Date:
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12/30/2006 10:39:39 AM
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Hi folks,
I want to write a XSLT gets properties e.g. XPath-Expression from one file and apply it to a different one. I tried this:
<!--Propertie file:-->
<rule>
<!-- pX is the old node; pX_ is a new node-->
<xpath attribute1="p1" attribute2="p1_"/>
<xpath attribute1="p2" attribute2="p2_"/>
</rule>
<!--XML file:-->
<test>
<p1/>
<p2/>
<p3/>
</test>
<!--I want to have this output:-->
<test>
<p1_/>
<p2_/>
<p3/>
</test>
<!--I tried this XSLT:-->
<xsl:param name="document" select="document('XMLfile.xml')"/>
<xsl:template match="/rule//xpath">
<xsl:apply-templates select="$document" mode="document_">
<xsl:with-param name="attribute1" select="./@attribute1" tunnel="yes"/>
<xsl:with-param name="attribute2" select="./@attribute2" tunnel="yes"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="/" mode="document_">
<xsl:param name="attribute1"/>
xsl:apply-templates select="$attribute1" mode="tag_"/>
</xsl:template>
<xsl:template match="p1" mode="tag_">
<xsl:param name="attribute2"/>
<xsl:element name="{$attribute2}"/>
</xsl:template>
The code is not complete, but I failure to apply the p1-template. Could anybody help me?
Thanks a lot.
Clyne
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Reply By:
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mhkay
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Reply Date:
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12/30/2006 5:26:54 PM
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There's no standard way in XSLT of constructing an XPath expression at run-time (or reading it from a file at run-time) and then evaluating it. Several products have extension functions to do this (e.g. saxon:evaluate() in Saxon). Alternatively, consider using XSLT to construct a stylesheet that incorporates the XPath expressions, and then executing that stylesheet.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
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Reply By:
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Clyne
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Reply Date:
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12/30/2006 8:44:18 PM
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Thanks Michael. I used the extension function but it doesn't work:
...
<xsl:apply-templates select="$document" mode="document_">
<xsl:with-param name="attribute1" select="./@attribute1" tunnel="yes"/>
</xsl:apply-templates>
...
<xsl:template match="/" mode="document_">
<xsl:param name="attribute1" select="default"/>
<xsl:variable name="test" select="concat('/*//',$attribute1)"/>
<xsl:value-of select="$attribute1"/>
<xsl:apply-templates select="saxon:evaluate($test)" mode="tag_"/>
</xsl:template>
The value-of select gives the values of with-param back and overwrite default respectively. But in saxon:evaluate(..) I get an exception: Static error in XPath expression supplied to saxon:evaluate: XPath syntax error at char 4 in {/*//}: Unexpected token "<eof>" in path expression. Did I overlook a fault? Thanks at forward.
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Reply By:
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mhkay
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Reply Date:
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12/31/2006 10:17:37 AM
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The argument supplied to saxon:evaluate() must be a valid XPath expression. "/*//" is not a valid XPath expression.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
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Reply By:
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mhkay
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Reply Date:
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12/31/2006 10:19:18 AM
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Looking more deeply, $attribute1 is taking its default value of "", because the supplied parameter said tunnel="yes" and the xsl:param declaration implies tunnel="no".
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
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Reply By:
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Clyne
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Reply Date:
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1/2/2007 9:56:03 AM
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Thanks Michael. The point with the 'tunnel'-Attribute I did not see.
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