<xsl:template match="filesystem">

so here, your current node is filesystem

 <xsl:when test="file/document(.)/...

file at this point selects all the file elements, and so this loads all
the files.


what I think you want to do is just 

<xsl:apply-templates select="file">

and have

<xsl:template
match="file[document(.)/xh:html/xh:head/xh:link/attribute::rel[contains(.,'stylesheet')]]">
   <xsl:apply-templates select="." mode="neuerTest"/>
</xsl:template>




David

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