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[xsl] Working with entities and notations

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I havea  sitatuation where I need to process the following content:

<!DOCTYPE dmodule [
<!ENTITY ICN-GAASIB0-01-32-00-00-G00-0A-0YJB5-00002-B-B-01 SYSTEM
"ICN-GAASIB0-01-32-00-00-G00-0A-0YJB5-00002-B-B-01.cgm" NDATA cgm>
<!ENTITY ICN-GAASIB0-01-32-13-01-G00-0A-0YJB5-00001-B-B-01 SYSTEM
"ICN-GAASIB0-01-32-13-01-G00-0A-0YJB5-00001-B-B-01.cgm" NDATA cgm>
]>
<dmodule>
<graphic boardno="ICN-GAASIB0-01-32-13-01-G00-0A-0YJB5-00001-B-B-01">
<graphic boardno="ICN-GAASIB0-01-32-00-00-G00-0A-0YJB5-00002-B-B-01">
</dmodule>

The <graphic> has the following schema definition:

   <xs:element name="graphic" type="graphicType"/>
    <xs:complexType name="graphicType">
        <xs:sequence>
            <xs:element minOccurs="0" ref="applic"/>
            <xs:element maxOccurs="unbounded" minOccurs="0" ref="hotspot"/>
            <xs:element maxOccurs="unbounded" minOccurs="0" ref="rfa"/>
        </xs:sequence>
        <xs:attribute ref="refapplic"/>
        <xs:attribute ref="boardno" use="required"/>
        <xs:attribute ref="reprowid"/>
        <xs:attribute ref="reprohgt"/>
        <xs:attribute ref="reproscl"/>
        <xs:attributeGroup ref="bodyatt"/>
        <xs:attributeGroup ref="cntlcontent"/>
        <xs:attributeGroup ref="secur"/>
        <xs:attributeGroup ref="xlink:XLINKATT0"/>
    </xs:complexType>

I can see how unparsed-entity-uri() will get me the SYSTEM information by
using the boardno attribute on the graphic tag. My problem is that I don't
see anyway to extract the notation or NDATA value. I know I have at least
CGM and ISO (IsoDraw) notations that I need to work with, so I can't just
default to CGM.

I'm trying to convert this XML file and produce a slightly modified one
without changing the schema or the existing markup. My only thought
currently is to preprocess with Perl or something - make some new dummy
tags with the information and then do my actual pass using that info and
stripping out the intermediate tags. Seems like there should be a better
way.

..dan

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