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XSL : XML Transformation - I want to permorm some operations when a particular tag occures else other operation

Posted on 2003-12-09
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Last Modified: 2010-04-17
Hi Experts !!!
   
    Pls Help me out of this prob. What i am trying to do is to transform one xml to another using xsl. my input xml look like
        <root>
              <child>
                     <attrib1>value</attrib1>
                     <attrib1>value</attrib1>
                     <subchild>
                                  <subattrib>value</subattrib>  
                     </subchild>
             </child>
              <child>
                     <attrib1>value</attrib1>
                     <attrib1>value</attrib1>
                    <grandchild>
                              <gattrib>value</gattrib>
                    </grandchild>                    
             </child>
      </root>    

           Here note that inside child tag either subchild can occure or grandchild but not both.
     and in xsl i want to perform something when inside child tag i have subchild tag
& somthing else when i have grandchild inside childtag. & i want to make sure that atleast one exists .

           So could pls suggest me how can i determine in xsl that inside child tag wheather subchild exists or grandchild ??
 
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Question by:Suyash
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by:Karl Heinz Kremer
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What would you do if you see both subchild and grandchild? What about when none of them exists?  

I would make sure that these conditions are met in the XML file, and not leave it up to the transformation to do the error checking. In this case, you can use something like this:

     <xsl:for-each select="root">
      <xsl:if test="child/subchild">
     ... do something ...
      </xsl:if>
      <xsl:if test="child/grandchild">
     ... do something else ...
      </xsl:if>
      </xsl:for-each>

This would not correctly handle the case where you have both, or where none of them exists.

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by:Karl Heinz Kremer
Comment Utility
... here is a better solution:

<xsl:for-each select="root/child">
      <xsl:variable name="subchild" select="count(child::subchild)"/>
      <xsl:variable name="grandchild" select="count(child::grandchild)"/>
 
      <xsl:if test="$subchild = 0 and $grandchild >= 1">
... handle the case with one or more grandchildren
      </xsl:if>

    <xsl:if test="$subchild >= 1 and $grandchild = 0">
... handle the case with one or more subchildren
      </xsl:if>

        <xsl:if test="$subchild > 0 and $grandchild > 0">
... handle the case with subchild and granchild
        </xsl:if>

        <xsl:if test="$subchild = 0 and $grandchild = 0">
... handle the case with no subchild and no granchild
        </xsl:if>

      </xsl:for-each>
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