Off the top of my head it seems the easiest would be to use the translate function within the select attribute of a variable to convert spaces into non-spaces (nothing) and then use a simple boolean test to determine what to do next if it returns false... For example...

<xsl:variable name="testWhiteSpace" select="translate(foo/bar, ' ', '')" />

<xsl:if test="$testWhiteSpace">
...do something
</xsl:if>

Untested.

Hope this helps!

<M:D/>

Ralph Holz wrote:

Hi,

is there a way to check if a given value is whitespace(s) only? A function maybe?

Thanks,
Ralph