Question

I am parsing an XSL file with XSL. And I have a problem dynamically finding nodes in it. Here is the scenario:

<linkbase xmlns="http://www.xbrl.org/2003/linkbase"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <labelLink xmlns:xlink="http://www.w3.org/1999/xlink" 
                xlink:role="http://www.xbrl.org/2003/role/link" 
                xlink:type="extended">
        <loc xlink:type="locator" 
                    xlink:href="de-gaap-ci-2010-12-16.xsd#de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other" 
                    xlink:label="de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other"/>

        <!-- many <loc... elements -->

        <labelArc xlink:from="de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other"
                xlink:to="label_de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other" 
                priority="1" 
                xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label"
                xlink:type="arc"/>

        <!-- many <labelArc... elements -->

     </labelLink>
</linkbase>

I am parsing the labelArc elements and want to include the information from the loc elements. This is done with SAP/ABAP…

My XSL code looks as follows:

<xsl:stylesheet version="1.0"
 xmlns:lb="http://www.xbrl.org/2003/linkbase"
 xmlns:xlink="http://www.w3.org/1999/xlink">

    <xsl:template match="lb:labelArc">
        <xsl:variable name="arc_to" select="@xlink:to"/>

      <TY_T_LABELARC>
        <LOC>  <xsl:value-of select="//lb:loc[@xlink:label='$arc_to']/@xlink:href"/> </LOC>
        <FROM> <xsl:value-of select="@xlink:from"/> </FROM>
        <TO>   <xsl:value-of select="@xlink:to"/> </TO>
        <!-- Other values follow -->
      </TY_T_LABELARC>

    </xsl:template>

I expect this result:

<TY_T_LABELARC>
   <LOC>de-gaap-ci-2010-12-16.xsd#de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other</LOC>
   <FROM>de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other</FROM>
   <TO>label_de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other</TO>
</TY_T_LABELARC>

My problem is that it’s all okay except the element LOC which has an empty value (<LOC/>).

It means this xpath expression returns an empty value:

<xsl:value-of select="//lb:loc[@label='$arc_to']/@href"/>

The goal of this statement is to get the attribute href from the element loc. I can find the corresponding loc tag with the value of @to of each labelArc tag.

I tried it both with the leading namespace “xlink:” on each attribute and without it…

Any ideas?

Answer 1

There are two issues with your code:

Firstly:

    <xsl:variable name="arc_to"       
       select="@xlink:to"/>

Do notice that the value of the attribute xlink:to of the element labelArc starts with the string "label_" — and the xlink:label attribute of loc doesn’t start with this string.

So you should write:

    <xsl:variable name="arc_to"
      select="substring-after(@xlink:to, 'label_')"/>

Secondly:

    <xsl:value-of select="//lb:loc[@xlink:label='$arc_to']/@xlink:href"/>

this compares @xlink:label to the string "$arc_to" — not to the variable $arc_to.

So you should write:

    <xsl:value-of select="//lb:loc[@xlink:label= $arc_to]/@xlink:href"/>

The corrected code:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:lb="http://www.xbrl.org/2003/linkbase"
 xmlns:xlink="http://www.w3.org/1999/xlink"
  exclude-result-prefixes="lb xlink">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:template match="lb:labelArc">
    <xsl:variable name="arc_to"
      select="substring-after(@xlink:to, 'label_')"/>

  <TY_T_LABELARC>
    <LOC>  <xsl:value-of select="//lb:loc[@xlink:label= $arc_to]/@xlink:href"/> </LOC>
    <FROM> <xsl:value-of select="@xlink:from"/> </FROM>
    <TO>   <xsl:value-of select="@xlink:to"/> </TO>
    <!-- Other values follow -->
  </TY_T_LABELARC>
 </xsl:template>
</xsl:stylesheet>

when this transformation is applied to the provided XML document:

<linkbase
  xmlns="http://www.xbrl.org/2003/linkbase"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <labelLink xmlns:xlink="http://www.w3.org/1999/xlink"
             xlink:role="http://www.xbrl.org/2003/role/link"
             xlink:type="extended">
    <loc xlink:type="locator"
         xlink:href="de-gaap-ci-2010-12-16.xsd#de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other"
         xlink:label="de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other"/>

            <!-- many <loc... elements -->

   <labelArc priority="1" xlink:type="arc"
     xlink:from="de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other"
     xlink:to="label_de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other"
     xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" />

            <!-- many <labelArc... elements -->

 </labelLink>
</linkbase>

the wanted, correct result is produced:

<TY_T_LABELARC>
   <LOC>de-gaap-ci-2010-12-16.xsd#de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other</LOC>
   <FROM>de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other</FROM>
   <TO>label_de-gaap-ci_bs.ass.fixAss.fin.otherLoans.other</TO>
</TY_T_LABELARC>