On 6 December 2011 14:17,<charlieo0@xxxxxxxxxxx> wrote:

I could use some help with the following problem.

I have an XML instance that is a long list of table entries. I need to compare text nodes and if they are the same, restructure an aspect of the row. I have been able to write something that will compare only the first following and first preceding rows, but I need to be able to traverse multiple rows until the matching stops. If there is no duplicate NSN, then merely copy the row as is.

Use a for-each-group selecting the nsnindxrow, grouping on the nsn,
and within its body use copy-of="current-group()/callout" to get all
the callouts for that nsn (the current-grouping-key())

  <xsl:template match="nsnindx">
    <xsl:copy>
      <!-- group-by="nsn" assumption: the string value of nsn is unique
           for every possible combination of fsc and niin -->
      <xsl:for-each-group select="nsnindxrow" group-by="nsn">
        <!-- the context item is the first item in each group,
             so copy and copy-of work on the first group item and
             its nsn child, respectively: -->
        <xsl:copy>
          <xsl:copy-of select="nsn" />
          <xsl:sequence select="current-group()/callout" />
        </xsl:copy>
      </xsl:for-each-group>
    </xsl:copy>
  </xsl:template>