OK,
excuse, its seems i am with my brain on other place than here.
Peace,
Hans Braumüller
Believe in Progress
http://ausbeutung.com
Is empty equal to not exist?
No
a="" is an existing attribute node with string value empty.
If you want to copy attribute a if it exists and do nothing otherwise,
that's
<xsl:copy-of select="@a"/>
If you only want to copy a if its value is non empty then that is
<xsl:copy-of select="@a[. != '']"/>
[. != ''] is, as you say, the same as [string(.) != '']
it is also the same as [string(.)] as in a boolean predicate the string
will be taken as true if it is non empty and false if it is empty.
David
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