Question

I am a beginner to XSLT.

My Source XML is as below:

<Passengers>
    <Passenger type="A" id="P1"/>
    <Passenger type="A" id="P2"/>
    <Passenger type="B" id="P3"/>
    <Passenger type="C" id="P4"/>
</Passengers>

The out-put should be as below:

<Pax_Items>
     <Item>
         <Type>A</Type>
         <Count>2</Count>
     </Item>
     <Item>
         <Type>B</Type>
         <Count>1</Count>
     </Item>
     <Item>
         <Type>C</Type>
         <Count>1</Count>
     </Item>
</Pax_Items>

I have created XSLT as below

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

    <xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />
        <xsl:variable name="filter" select="'TK,AJ'"/>

    <xsl:template match="Passengers">
        <xsl:element name="Pax_Items">
            <xsl:apply-templates select="Passenger"/>
        </xsl:element>
    </xsl:template>

        <xsl:template match="Passenger">
              <xsl:element name="Item">
                     <xsl:element name="Type">
                           <xsl:value-of select="@type"/>
                     </xsl:element>
                     <xsl:element name="Count">
                           <xsl:value-of select="count(//Passenger[@type=current()/@type])"/>
                     </xsl:element>
              </xsl:element>
    </xsl:template>
</xsl:stylesheet>

With above XSLT i got the below output:

<Pax_Items>
  <Item>
    <Type>A</Type>
    <Count>2</Count>
  </Item>
  <Item>
    <Type>A</Type>
    <Count>2</Count>
  </Item>
  <Item>
    <Type>B</Type>
    <Count>1</Count>
  </Item>
  <Item>
    <Type>C</Type>
    <Count>1</Count>
  </Item>
</Pax_Items>

How can i omit or skip the duplicate element? Please help.

Answer 1

Update your passenger template as follows; I have added if condition to check duplicate nodes,

<xsl:template match="Passenger">
    <xsl:if test="not(preceding-sibling::Passenger[@type = current()/@type])">
      <xsl:element name="Item">
        <xsl:element name="Type">
          <xsl:value-of select="@type"/>
        </xsl:element>
        <xsl:element name="Count">
          <xsl:value-of select="count(//Passenger[@type=current()/@type])"/>
        </xsl:element>
      </xsl:element>
    </xsl:if>
  </xsl:template>