tokenize function

hello,
I want know how can I use the tokenize function of xslt 2.0,and what namespace must I declare.
I use xmlspy to validate my xsl file, but I have always an error with the follow line. can you help me to correct it.
<xsl:value-of select= "fn:tokenize(*/gml:boundedBy/gml:Box/gml:coord, " \ s * " )" />
Thank you advanced.


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