xpath predicate help

I am transforming SGML to XML.
The sample sgml is:

<graphic id="123" name="graphic" ......>
        <grphprim id="456" ....>
</graphic>
.
.
.
<link linkends="999 456">link text</link>

What I am trying to do is. When I find a link to a <grphprim element in sgml
I want the xml link I create to link to the parent <graphic.  The linkends 
attribute needs
to be manipulated to get the part after the space.

The xml I am using  that does not work 

<xsl:element name="link">
        <xsl:attribute name="linkend">
                <xsl:variable name="link-target"
                        <xsl:value-of select="substring-after(./@linkends,' 
')"/>
                </xsl:variable>
                <xsl:choose>    
                        <xsl:when 
test="name(//*[(_at_)id=$link-target])='grphprim'">
                                <xsl:variable name="parent_graphic" 
select="//graphic[grphprim/@id=$link-target]"/>
                                <xsl:value-of select="$parent_graphic/@id">
                        </xsl:when>
                        <xsl:otherwise>
                                <xsl:value-of select="$link-target"/>
                        </xsl:othewise>
                </xsl:choose>
        </xsl:attribute>
</xsl:element>

This however does work.  If I hard-code the id in below it works, If I use a 
variable as in above it does not work. 
Any help would be appreciated.

<xsl:element name="link">
        <xsl:attribute name="linkend">
                <xsl:variable name="link-target"
                        <xsl:value-of select="substring-after(./@linkends,' 
')"/>
                </xsl:variable>
                <xsl:choose>    
                        <xsl:when 
test="name(//*[(_at_)id=$link-target])='grphprim'">
                                <xsl:variable name="parent_graphic" 
select="//graphic[grphprim/@id='456']"/>
                                <xsl:value-of select="$parent_graphic/@id">
                        </xsl:when>
                        <xsl:otherwise>
                                <xsl:value-of select="$link-target"/>
                        </xsl:othewise>
                </xsl:choose>
        </xsl:attribute>
</xsl:element>

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