for-each select=preceding-sibling::address[zip=./zip] : for each « XSLT stylesheet « XML Tutorial

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XML Tutorial » XSLT stylesheet » for each 
5. 45. 4. for-each select=preceding-sibling::address[zip=./zip]
File: Data.xml

<?xml version="1.0"?>
<addressbook>

  <address>
    <name>
      <title>Ms.</title>
      <first-name>Doris</first-name>
      <last-name>Smith</last-name>
    </name>
    <street>707 New Way</street>
    <city>New York</city>
    <state>ME</state>
    <zip>00218</zip>
  </address>
  <address>
    <name>
      <title>Ms.</title>
      <first-name>Jane</first-name>
      <last-name>Lee</last-name>
    </name>
    <street>930-A Street</street>
    <city>Twincity</city>
    <state>MA</state>
    <zip>02930</zip>
  </address>
</addressbook>

File: Transform.xslt

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

  <xsl:output method="text" indent="no"/>

  <xsl:variable name="newline">
  <xsl:text></xsl:text>
  </xsl:variable>

  <xsl:template match="/">
    <xsl:text>Addresses sorted by zip code</xsl:text>
    <xsl:value-of select="$newline"/>
    <xsl:for-each select="addressbook/address">
      <xsl:sort select="zip"/>
      <xsl:choose>
        <xsl:when test="not(preceding-sibling::address[zip=./zip])">
          <xsl:value-of select="$newline"/>
          <xsl:text>Zip code </xsl:text>
          <xsl:value-of select="zip"/>
          <xsl:text> (</xsl:text>
          <xsl:value-of select="city"/>
          <xsl:text>, </xsl:text>
          <xsl:value-of select="state"/>
          <xsl:text>): </xsl:text>
          <xsl:value-of select="$newline"/>
        </xsl:when>
        <xsl:otherwise>
          <xsl:message terminate="no">
            <xsl:text>./zip=</xsl:text><xsl:value-of select="./zip"/><xsl:text>, </xsl:text>
            <xsl:for-each select="preceding-sibling::address[zip=./zip]">
              <xsl:text>preceding-sibling=</xsl:text><xsl:value-of select="name/first-name"/><xsl:text> </xsl:text><xsl:value-of select="name/last-name"/>
            </xsl:for-each>
          </xsl:message>
        </xsl:otherwise>
      </xsl:choose>
      <xsl:if test="name/title">
        <xsl:value-of select="name/title"/>
        <xsl:text> </xsl:text>
      </xsl:if>
      <xsl:value-of select="name/first-name"/>
      <xsl:text> </xsl:text>
      <xsl:value-of select="name/last-name"/>
      <xsl:value-of select="$newline"/>
      <xsl:value-of select="street"/>
      <xsl:value-of select="$newline"/>
      <xsl:value-of select="$newline"/>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

Output:

Addresses sorted by zip codeZip code 00218 (New York, ME): Ms. Doris Smith707 New WayMs. Jane Lee930-A Street
5. 45. for each
5. 45. 1. The xsl:for-each element allows all nodes in a node-set to be processed according to the XSLT instructions nested inside the xsl:for-each element.
5. 45. 2. Nested for-each loop with sorting
5. 45. 3. Output xml elements in for-each loop
5. 45. 4. for-each select=preceding-sibling::address[zip=./zip]
5. 45. 5. for-each select=//address[generate-id(.)=generate-id(key(zipcodes, zip)[1])]
5. 45. 6. Use for-each loop to output list items
5. 45. 7. for-each select="addressbook/address" and sort
5. 45. 8. compares sorted and unsorted xsl:for-each element
5. 45. 9. xsl:for-each instruction contains a template, which is applied to each node selected with select attribute.
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