Nesting <xsl:value-of> tags

Hi,

I have an xsl stylesheet that reads an xml document and selects all nodes 
having a specific non-blank attribute.

The skeleton of my tags is as follows:


<xsl:for-each select="//*[./@filename != '']">
.
.
<xsl:value-of select="document('ShareWebUsers.xml')//person[id=<xsl:value-of 
select="../@ownedby"/>]/ntname"/>
.
.
</xsl:for-each> 


In the middle, I have an <xsl:value-of> tag that reads a value from another 
document (ShareWebUsers.xml) and returns the value of the <ntname> tag based on 
the value of "ownedby" attribute of the current node.

When I use the code as described above, XMLSPY informs me that my XML is not 
well-formed.

Is it possible to nest <xsl: value-of> tags like this?  If not, is there 
another way to look up the value of <ntname> from the other document?

TIA

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list