Grouping in XSLT

问题

Have the source XML:

<root>
      <element Key="card1_id">123</element>
      <element Key="card1_balance">500</element>
      <element Key="card2_id">456</element>
      <element Key="card2_balance">800</element>
      .............................................
      <element Key="card(n)_id">999</element>
      <element Key="card(n)_balance">8000</element>
</root>

Where n - the number of cards

With XSLT i need to get a HTML:

<b>Card 1:</b>   
  ID: 123 <br/> 
  Balance: 500 <br/>  

<b>Card 2:</b>   
  ID: 456<br/>  
  Balance: 800<br/> 
 ..................
<b>Card n:</b>   
  ID: 999<br/>  
  Balance: 8000<br/>

How to organize such grouping?

回答1:

Use Muechian grouping with XSLT 1.0:

<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0">

  <xsl:key name="k1" match="element" use="translate(@Key, translate(@Key, '0123456789', ''), '')"/>

  <xsl:output method="html" indent="yes"/>

  <xsl:template match="root">
    <div>
      <xsl:apply-templates select="element[generate-id() = generate-id(key('k1', translate(@Key, translate(@Key, '0123456789', ''), ''))[1])]" mode="group"/>
    </div>
  </xsl:template>

  <xsl:template match="element" mode="group">
    <b>Card <xsl:value-of select="translate(@Key, translate(@Key, '0123456789', ''), '')"/>:</b>
    <xsl:apply-templates select="key('k1', translate(@Key, translate(@Key, '0123456789', ''), ''))"/>
  </xsl:template>

  <xsl:template match="element">
    <xsl:value-of select="concat(substring-after(., '_'), ': ', .)"/>
    <br/>
  </xsl:template>

</xsl:stylesheet>

With that stylesheet Saxon 6.5.5 transforms

<root>
      <element Key="card1_id">123</element>
      <element Key="card1_balance">500</element>
      <element Key="card2_id">456</element>
      <element Key="card2_balance">800</element>
      .............................................
      <element Key="card3_id">999</element>
      <element Key="card3_balance">8000</element>
</root>

into

<div><b>Card 1:</b>: 123<br>: 500<br><b>Card 2:</b>: 456<br>: 800<br><b>Card 3:</b>: 999<br>: 8000<br></div>

回答2:

You don't say if you are using XSLT 1.0 or 2.0.

Also you don't really need grouping per se, to achieve the output.

e.g. the below would emit similar to what you want, with no grouping. Now if your data comes in a different order, then yes, you'd want grouping.

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="html"/>

<xsl:template match="/root/element[ends-with(@Key,'id')]">
 <b><xsl:value-of select="replace(@Key,'(.*)(\d.*)_id','$1 $2:')"/></b>   
  ID: <xsl:value-of select="."/> <br/> 
  Balance: <xsl:value-of select="following-sibling::element"/> <br/>
</xsl:template>

<xsl:template match="element"/>

</xsl:stylesheet>

来源：https://stackoverflow.com/questions/9740981/grouping-in-xslt