分组时xslt 1.0排序

Question

Last time I had some problems with grouping on xslt 1.0. Now I've faced another problem with sorting. Here is some code.

XML

<Development>
  <PlotTypes> 
    <Apartments>     
      <Building>             
        <PlotType Phase="1" />   
        <PlotType Phase="2" />         
      </Building>
    </Apartments>
  </PlotTypes>
  <Phases>
    <Phase ContentID="40514" PhaseCode="1" Title="Properties available to move in" SortOrder="2" />
    <Phase ContentID="40515" PhaseCode="2" Title="test" SortOrder="1" />
  </Phases>
</Development>

And here is XSLT

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes" />
    <xsl:key name ="phase" match="//PlotType" use="@Phase"/>
  <xsl:template match="Development">
    <xsl:for-each select="//PlotType[generate-id(.)=generate-id(key('phase',@Phase)[1])]">
      <xsl:sort select="//Phase[@PhaseCode=@Phase]/@SortOrder" order="ascending" data-type="number"/>
      <xsl:variable select="@Phase" name="groupedPhase"/>
              Phase - <xsl:value-of  select="@Phase"/><br/>
              Phase Sort order -  <xsl:value-of select="//Phase[@PhaseCode=$groupedPhase]/@SortOrder"/><br/>                
       <xsl:value-of select="//Phase[@PhaseCode=$groupedPhase]/@Title"/>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

And I need to make this final result

<?xml version="1.0" encoding="UTF-8"?>
              Phase - 2<br/>
              Phase Sort order -  2<br/>
<h3>test</h3>
              Phase - 1<br/>
              Phase Sort order -  1<br/>
<h3>Properties available to move in</h3>

But when I use such sorting <xsl:sort select="//Phase[@PhaseCode=@Phase]/@SortOrder"... it doesn't work.

Answer 1

Define a second key

<xsl:key name="phase-by-code" match="Phases/Phase" use="@PhaseCode"/>

then use

<xsl:sort select="key('phase-by-code', @Phase)/@SortOrder" order="ascending" data-type="number"/>

for your sort.