Re: [xsl] A use-case for xsl:merge?

On 15.02.2019 21:01, John Dziurlaj john(_at_)hiltonroscoe(_dot_)com wrote:
> The element prototypes can be in the same document or different documents,
> but for the purposes of the XSLT3 we are only concerned with merging the
> external references, such that we have a fully dereferenced (i.e.
> standalone) XML instance.
>
> I already have code to pull in the external references (prototypes) and run
> the XPath (via evaluate) on them. I've put all the code on GitHub to
> hopefully make this easier to understand.
I am not sure I understand all that sample code, there are two XML 
documents, one seems incomplete.
I am not sure it is a use case for xsl:merge (order their matters and I 
am not sure about the order of your items to be merged), I think it can 
be done with recursive templates using `for-each-group`:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:xs="http://www.w3.org/2001/XMLSchema";
    xmlns:math="http://www.w3.org/2005/xpath-functions/math";
    exclude-result-prefixes="xs math"
    version="3.0">

    <xsl:param name="prot-doc-uri" as="xs:string">prototype.xml</xsl:param>

    <xsl:param name="prot-doc" select="doc($prot-doc-uri)"/>

    <xsl:mode on-no-match="shallow-copy"/>

    <xsl:output indent="yes"/>

    <xsl:template match="*[@usehref]">
        <xsl:copy>
            <xsl:variable name="prototype" as="element()?">
                <xsl:evaluate xpath="@usehref" context-item="$prot-doc"/>
            </xsl:variable>
            <xsl:apply-templates select="." mode="merge-attributes">
                <xsl:with-param name="prototype" select="$prototype"/>
            </xsl:apply-templates>
            <xsl:apply-templates select="." mode="merge-children">
                <xsl:with-param name="prototype" select="$prototype"/>
            </xsl:apply-templates>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="*" mode="merge-attributes">
        <xsl:param name="prototype"/>
        <xsl:for-each-group select="@* except @usehref, $prototype/(@* 
except @name)" group-by="node-name()">
            <xsl:sequence select="."/>
        </xsl:for-each-group>
    </xsl:template>

    <xsl:template match="*" mode="merge-children">
        <xsl:param name="prototype"/>
        <xsl:for-each-group select="*, $prototype/*" 
group-by="node-name()">
            <xsl:copy>
                <xsl:apply-templates select="." mode="merge-attributes">
                    <xsl:with-param name="prototype" 
select="current-group()[2]"/>
                </xsl:apply-templates>
                <xsl:apply-templates select="." mode="merge-children">
                    <xsl:with-param name="prototype" 
select="current-group()[2]"/>
                </xsl:apply-templates>
            </xsl:copy>
        </xsl:for-each-group>
    </xsl:template>

</xsl:stylesheet>


That assumes the first input is e.g. (note that I had to adjust the 
XPath expression to use "@name" instead of "name")
<root>
    <draw name="Text1" usehref="/proto/draw[@name = 'TextStyle1']">

        <ui>

            <textEdit/>

        </ui>

        <value>

            <text>This is some text</text>

        </value>

        <border/>

        <font weight="bold"/>

    </draw>
</root>


and the referenced file has e.g.

<proto>
    <draw name="TextStyle1" w="29.2864mm" h="5.2331mm">

        <ui>

            <textEdit/>

        </ui>

        <border>

            <edge presence="hidden"/>

        </border>

        <font size="12pt" typeface="Myriad Pro"/>

        <margin topInset="0.5mm" bottomInset="0.5mm" leftInset="0.5mm" 
rightInset="0.5mm"/>
    </draw>
</proto>

then the result is

<root>
    <draw name="Text1" w="29.2864mm" h="5.2331mm">
      <ui>
         <textEdit/>
      </ui>
      <value>
         <text/>
      </value>
      <border>
         <edge presence="hidden"/>
      </border>
      <font weight="bold" size="12pt" typeface="Myriad Pro"/>
      <margin topInset="0.5mm"
              bottomInset="0.5mm"
              leftInset="0.5mm"
              rightInset="0.5mm"/>
   </draw>
</root>
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