Question

I have the following XML file:

<layout>
 <layout-structure>
  <layout-root id="layout-root">
    <layout-chunk id="header-text">
         <layout-leaf xref="lay-1.01"/>
         <layout-leaf xref="lay-1.02"/>
    </layout-chunk>
    <layout-leaf xref="lay-1.03"/>
  </layout-root>
  <layout-root id="layout-root-two">
    <layout-chunk id="header-text-two">
     <layout-leaf xref="lay-1.04"/>
     <layout-leaf xref="lay-1.05"/>
     <layout-leaf xref="lay-1.06"/>
    </layout-chunk>
  <layout-leaf xref="lay-1.07"/>
 </layout-root>
</layout-structure>

<realization>
  <text xref="lay-1.01 lay-1.04"/>
  <text xref="lay-1.02 lay-1.05"/>
  <graphics xref="lay-1.03 lay-1.06" type="1"/>
  <graphics xref="lay-1.07" type="2"/>
</realization>
</layout>

I want to extract the values for the xref attribute of the graphics element, in order to limit the output in the for clause of the function shown below.

declare function local:gfx($root, $graphics) {
let $graphic-xrefs := tokenize($graphics/@xref, " ")
for $layout-leafs in $root//layout-leaf[@xref = $graphic-xrefs]
return concat('"', $layout-leafs/@xref, '" ', $dotgraphics, ';', $newline) 
};

This, however, causes an error because some of the xref attributes under the graphics element contain a single value, as in the case of <graphics xref="lay-1.07"/>.

Is it possible to use tokenize to fetch the graphics/xref values, or should I use a different approach?

Answer 1

You could try changing the way you create $graphic-xrefs…

declare function local:gfx($root, $graphics) {
    let $graphic-xrefs := 
        for $xref in $graphics/@xref
        return
            tokenize($xref,' ')
    for $layout-leafs in $root//layout-leaf[@xref = $graphic-xrefs]
    return concat('"', $layout-leafs/@xref, '" ', $dotgraphics, ';', $newline) 
};