I have a series of files containing non-xml text. I wish to conditionally include them into an xml file based on the data.

eg.
<messageList>
<message fileid="4010"/>
<message fileid="3202"/>
</messageList>

and then inside the files referenced by the file id attribute are some random non-xml text.

what I have:
<xsl:template match="/messageList">
<conversation>
<xsl:for-each select = "message">
<msg>
<xsl:value-of select="document(fileid)"/>
</msg>
</xsl:for-each>
</conversation>
</xsl:template>

Is there some way to do this?