Hi there,

I have a number of files with tei:l elements in them.  So I create a collection:
<xsl:variable name="docs" select="collection($path)"/>
and then want to iterate over the collection grouping all first lines
together, all second lines together, etc.

<xsl:for-each-group select="$docs//tei:l" group-by="f:position()">
...
</xsl:for-each-group>

<xsl:function name="f:position" as="xs:integer">
  <xsl:param name="node" as="node()"/>
  <xsl:number select="$node" level="any"/>
</xsl:function>

Michael Kay
Saxonica