Filemaker XSL Select Column By Name - xslt

Question

I am looking to export from Filemaker using column names (instead of positions). Currently I export the following XSL stylesheet that exports by position with:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fm="http://www.filemaker.com/fmpxmlresult" exclude-result-prefixes="fm" >
<xsl:output method="xml" version="1.0" encoding="utf-8" indent="yes"/>
<xsl:template match="/">
<people>
<xsl:for-each select="fm:FMPXMLRESULT/fm:RESULTSET/fm:ROW">
<person>
<name>
<xsl:value-of select="fm:COL[01]/fm:DATA"/>
</name>
<location>
<xsl:value-of select="fm:COL[02]/fm:DATA"/>
</location>
</person>
</xsl:for-each>
</people>
</xsl:template>
</xsl:stylesheet>
Any ideas? Thanks.

Answer 1

If you just want to make the code more readable, then I'd suggest something simple, like:
<!-- expected columns -->
<xsl:variable name="NAME" value="1" />
<xsl:variable name="LOCATION" value="2" />
<!-- ... -->
<people>
<xsl:for-each select="fm:FMPXMLRESULT/fm:RESULTSET/fm:ROW">
<person>
<name>
<xsl:value-of select="fm:COL[$NAME]/fm:DATA"/>
</name>
<location>
<xsl:value-of select="fm:COL[$LOCATION]/fm:DATA"/>
</location>
</person>
</xsl:for-each>
</people>
BTW, with <xsl:value-of /> you can omit the fm:DATA, i.e. use:
<xsl:value-of select="fm:COL[$LOCATION] />
It will return the same result.
If you need something more sophisticated, please explain.
Update:
To refer to columns by column names is harder, but possible with something like that:
<!-- Define a key to get a field and all fields that precede it by the field name -->
<xsl:key name="N" match="/fm:FMPXMLRESULT/fm:METADATA/fm:FIELD" use="#NAME" />
<xsl:key name="N" match="/fm:FMPXMLRESULT/fm:METADATA/fm:FIELD"
use="following-sibling::fm:FIELD/#NAME" />
<!-- Then *count* them it in the code like that -->
<people>
<xsl:for-each select="fm:FMPXMLRESULT/fm:RESULTSET/fm:ROW">
<person>
<name>
<xsl:value-of select="fm:COL[count(key('N', 'name'))]" />
</name>
<location>
<xsl:value-of select="fm:COL[count(key('N', 'location'))]" />
</location>
</person>
</xsl:for-each>
</people>
Not utterly elegant, but works.