[xsl] want to sort and resolve <xref> values in one pass (XSL-FO)

["Flanders, Charles E (US SSA) charles.flanders@xxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

I am currently using a two-step process to sort a list of cross references in
an FO file. I run the pub through my XSL-FO style sheets, then run my
resultant FO file through a second XSLT (FO to FO) to sort the results of
resolved cross references.

I have a list of cross references the looks like this:

      <ref>
       <ref-setup-item>
        <xref wpid="t2034592355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2001792355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2002292355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2004392355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2087492355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2087692355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2078292355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2078392355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2078692355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2110492355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2078892355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2085792355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2002492355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2002992355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2003292355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2089592355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2089692355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2089792355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2003592355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2003692355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2003492355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2003792355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2100192355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2003992355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2004092355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2004192355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2100092355314"/>
       </ref-setup-item>
       <ref-setup-item>
        <xref wpid="m2033692355314"/>
       </ref-setup-item>
      </ref>

The FO output is this:



                  <fo:block widows="2" orphans="2" space-before.minimum="6pt"
space-before.optimum="7pt"
                            space-before.maximum="8pt"
                            space-after.minimum="0pt"
                            space-after.optimum="0pt"
                            space-after.maximum="1pt"
                            span="none" role="REFERENCES">
                     <fo:block font-weight="bold"
keep-with-next.within-column="always">References</fo:block>
                     <fo:block font-weight="normal"
keep-with-previous.within-column="always" span="none"
                               start-indent="12pt"
                               text-align="left">
                        <fo:basic-link>Vol. 4, WP 0313</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left"
                               keep-with-previous.within-column="always">
                        <fo:basic-link>Vol. 8, WP 0598</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 9, WP 0772</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0681</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0613</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0635</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0645</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0646</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 9, WP 0773</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0647</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0654</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0632</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0639</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0655</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0662</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0663</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0664</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0665</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0667</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0668</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0634</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0666</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0642</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0674</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0675</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 8, WP 0676</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 10, WP 0926</fo:basic-link>
                     </fo:block>
                     <fo:block font-weight="normal" span="none"
start-indent="12pt" text-align="left">
                        <fo:basic-link>Vol. 10, WP 0988</fo:basic-link>
                     </fo:block>
                  </fo:block>

Currently I run a second XSLT (below> to sort the FO output.

    <xsl:template match="fo:block[@role='REFERENCES']">
        <fo:block widows="2" orphans="2" space-before.minimum="6pt"
space-before.optimum="7pt" space-before.maximum="8pt"
space-after.minimum="0pt" space-after.optimum="0pt" space-after.maximum="1pt"
span="none" role="REFERENCES">
            <xsl:copy-of select="child::fo:block[1]"/>
                <xsl:apply-templates select="child::fo:block[position() &gt;
1]">
                    <xsl:sort
select="substring-after(fo:basic-link/text(),'WP')"/>
                </xsl:apply-templates>
        </fo:block>
    </xsl:template>

Instead of running the second XSLT, I want to perform the sort with the
initial style sheet run. I know I can capture the unsorted output into a
variable, but where I'm having trouble is sorting the contents (value) of the
variable and then writing out the sorted output. What I have so far (and this
is just a snippet of a much larger XSL-FO style sheet of nearly 80 modules).

	<xsl:template match="ref">
		<fo:block space-before.maximum="8pt" space-before.minimum="6pt"
space-before.optimum="7pt" span="none" xsl:use-attribute-sets="wpinfosub">
			<fo:block font-weight="bold" keep-with-next.within-column="always">
				<xsl:text>References</xsl:text>
			</fo:block>
			<xsl:variable name="REFS">
				<xsl:apply-templates select="child::ref-setup-item"/>
			</xsl:variable>
			<xsl:apply-templates select="$REFS">
				<xsl:sort select="substring-after(child::basic-link/text(),'WP')"/>
			</xsl:apply-templates>
		</fo:block>
	</xsl:template>


The above does not work. I do know that the value of $REFS is correct in that
I've used <xsl-copy-of select="$REFS" to verify the value or contents of
$REFS. How I do sort the value of $REFS and put it into the output? Using the
above is outputting the <fo:root> and  <fo:layout-master-set>, then "value-of"
(just text) $REFs with no FO markup. What am I missing?


C Flanders