[xsl] creating a temporary document from multiple inputs

[Wolfgang Laun <wolfgang.laun@xxxxxxxxx>]

XSLT 2.0.

I had to create a single document from several inputs (so that a key
lookup could access them all with a single call):

<xsl:variable name="doc" as="document-node()">
 <xsl:document>
   <xsl:sequence select="document($paths)/*"/>
 </xsl:document>
</xsl:variable>
 <xsl:key name="kSkips"
         match="element()[@omc:ilp='0']"
         use="@name"/>

 <xsl:variable name="look" select="key('kSkips',$name,$doc)"/>

What surprised me was that I could use
 <xsl:sequence select="document($paths)"/>
without an error, which would make the document-nodes of the inputs
children of the temporary document-node. Is the XSL processor clever
enough to handle this? Where can I find more information about this?

Thanks for enhancing my education ;-)
Wolfgang