[xsl] SSI echo as an attribute value

["tom tom" <tomxsllist@xxxxxxxxxxx>]

Hi all, can you advise on the best way to embed an SSI echo as the value of 
an attribute in XSLT 2:

<a href="<!-- #echo var="service.module" -->">text</a>

I have tried using a character map to represent the opening and closing 
comments:

<xsl:character-map name="comment-delimiters">
 <xsl:output-character character="&start-comment;" string="&lt;!--"/>
 <xsl:output-character character="&end-comment;" string="--&gt;"/>
</xsl:character-map>

with following doctype:

<!DOCTYPE xsl:stylesheet [
<!ENTITY  start-comment "&#xE501;">
<!ENTITY  end-comment "&#xE502;">
]>

and the following call:

<a>
<xsl:attribute 
name="href"><xsl:text>&start-comment;</xsl:text>fff<xsl:text>&end-comment;</xsl:text></xsl:attribute>
</a>

This doesn't work. Given that 'disable-output-escaping' is deprecated in 
XSLT 2 how would you advise doing this task?

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