[xsl] Saxon 6.5.5 v Saxon-EE 9.3.0.5

["Flanders, Charles E (US SSA)" <charles.flanders@xxxxxxxxxxxxxx>]

Can someone please explain to me why this code:

<fo:basic-link>
   <xsl:text disable-output-escaping="yes">Figure&#38;#x00A0;</xsl:text>
      <xsl:for-each select="id(@assocfig)">
         <xsl:number count="figure" format="1" from="//ginfowp | //maintwp |
//thrywp | //ctrlindwp" level="any"/>
      </xsl:for-each>
</fo:basic-link>

Produces the expected result when I use Saxon 6.5.5 but produces no output
when I use Saxon-EE 9.3.0.5 with Oxygen 13? Specifically the use of the id()
function.

I have other instances in the style sheets using the id() function where the
same problem arises.

Thanks.

C Flanders