What's the difference? An empty element is an empty element.
I shall Export invoice from Filemaker to my businessprogram
The buisnessprogram dont accept
It shall look like this
Then your business program doesn't conform to the XML specification. Anyway, you have no direct control over this - but you could try a hack:
... <xsl:text disable-output-escaping="yes"><A></xsl:text> <xsl:value-of select="fmp:COL/fmp:DATA"/> <xsl:text disable-output-escaping="yes"></A></xsl:text> ...
The Company who have done the businessprogram shall make a new XML schema.
Thanks for help