xslt - XPath selector not working during PDF transformation -

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i have dita bookmap storing image paths:

<bookmap>     <bookmeta>         <data id="productlogo">             <image href="images/_notrans/frontcover/productlogo.svg" />         </data>         <data id="productphoto" >             <image href="images/_notrans/frontcover/productphoto.jpg" />         </data>     </bookmeta> </bookmap>

then attempt grab href values data[@id]:

<xsl:variable name="productlogo"><xsl:value-of select="//data[@id='productlogo']/image/@href" /></xsl:variable> <xsl:variable name="productphoto"><xsl:value-of select="//data[@id='productphoto']/image/@href" /></xsl:variable>

(these xpath expressions match href when test against bookmap in oxygen.)

during transformation output:

<xsl:message>productphoto: <xsl:value-of select="$productphoto"/></xsl:message>

the value-of empty.

however, works expected if replace id attribute numbers:

<xsl:variable name="productlogo"><xsl:value-of select="//data[1]/image/@href" /></xsl:variable> <xsl:variable name="productphoto"><xsl:value-of select="//data[2]/image/@href" /></xsl:variable>

what doing wrong that's preventing using @id="whatever"?

the xslt not applied directly on bookmap contents, applied on xml document contains bookmap topic references expanded in , preprocessing applied it. if set "clean.temp" parameter "no" find in temporary files folder file called "mapname_merged.xml", xml document on xslt applied , see in it, ids have been changed unique in context of entire xml document.

when working data elements should set @name attribute them like:

<data name="productlogo">

and match name in xslt code. there examples of using "data" in dita 1.2 specs well:

http://docs.oasis-open.org/dita/v1.2/os/spec/langref/data.html#data


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