<xsl:template match="*">
  .. identity template ..
</xsl:template>

<xsl:template match="processing-instruction(line)">
<xsl:value-of select="saxon:line-number(.)"/>
</xsl:template>

Michael Kay
Saxonica

To whom it may concern,

in C there's a pre-processor directive

__LINE__

that gives you the line of source where the directive is.

Is there an equivalent in XSLT?

Many thanks

Best regards

Bartolomeo