You haven't said what transform you are tying to do so saying it doesn't
work doesn't really tell us much.
Both branches of your xsl:choose do the same thing, so it isn't clear
why you need an xsl:choose at all.


Both instances of 

<xsl:value-of
select="./win-registry-data/data"/><

generate an empty string as the current node is a data element and your
data elements don't have win-registry-data children and data
grandchildren.

You probably want <xsl:value-of select="."/> to get teh current element.

similarly test="./win-registry-data[@data] as that tests that the
current dtat element has a win-registry-data element child thathas an
attribute called dtat, butnone of your data elements have
win-registry-data children and no elements have an attribute. I
can't guess what test you intend here.

David


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