[xsl] determining if 2 sequences of strings intersect

Hi,

Is there an easy way to determine whether 2 sequences of xs:string+  
intersect. I am not able to use:
$seq1 intersect $seq2

because they need to be nodes.

An example with my lame(?) solution at the bottom:

I have a sequence of 'role' elements, e.g.

 <dbo.ROLE USER_ID="19955" ROLE="CAEMP"/>
 <dbo.ROLE USER_ID="19955" ROLE="INCPL"/>
 <dbo.ROLE USER_ID="19955" ROLE="MNGR"/>
 <dbo.ROLE USER_ID="19955" ROLE="NewHire"/>
 <dbo.ROLE USER_ID="19955" ROLE="NONHIEMP"/>
 <dbo.ROLE USER_ID="19955" ROLE="VEHALLW"/>

which is converted to a sequence of xs:string by:

<xsl:with-param name="roles"
 as="xs:string+"
 select="for $r in $roles return string($r/@ROLE)"
 tunnel="yes"/>


and I have an attribute that identifies role restrictions in another  
document context, e.g.
<task roleRestrictions="CAEMP VEHALLW"/>

which is converted to a sequence by:

<xsl:variable name="restrictions"
 select="tokenize(@roleRestrictions, ' ')"
 as="xs:string+"/>


So, what I am doing to get a value to show as true or false in a table  
cell is:
<xsl:sequence
 select="not(empty(index-of(f:has-role($roles, $restrictions),  
true())))"/>
....

 <xsl:function name="f:has-role" as="xs:boolean+">
   <xsl:param name="roles" as="xs:string+"/>
   <xsl:param name="restrictions" as="xs:string+"/>
   <xsl:sequence select="for $r in $restrictions return
     if (index-of($roles, $r)) then true() else false()"/>
 </xsl:function>


Is there a better way?

thanks,
-Rob

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