Use XSLT to enumerate Nodes with the same name

I have many many XML files that often contain nodes mutiple times (each time with different data). Example:

 <?xml version="1.0" encoding="UTF-8"?>  
    <SomeName>  
      <Node>
        DataA
     </Node>  
     <Node>
        DataB
     </Node>  
      <Node>
        DataC
     </Node>  
      <AnotherNode>
        DataD
     </AnotherNode>
      <AnotherNode>
        DataE
     </AnotherNode>
      <AnotherNode>
        DataF
     </AnotherNode>
     <SingleNode>
        DataG
     </SingleNode>
   </SomeName>  

The desired Output would be:

  <?xml version="1.0" encoding="UTF-8"?>  
    <SomeName>  
      <Node1>
        DataA
     </Node1>  
     <Node2>
        DataB
     </Node2>  
      <Node3>
        DataC
     </Node3>  
      <AnotherNode1>
        DataD
     </AnotherNode1>
      <AnotherNode2>
        DataE
     </AnotherNode2>
      <AnotherNode3>
        DataF
     </AnotherNode3>
     <SingleNode>
        DataG
     </SingleNode>
   </Some开发者_JAVA技巧Name>  

The Problem is, I don't have a list of all the duplicate Nodenames, so I need the XSLT to run through all nodes and only number those that exist multiple times. Is that possible?

Does anyone have a good idea on how to accomplish that?

Thanks!

---

You can use count(preceding-sibling::*[name(.) = name(current())]) to get the number of preceding sibling elements with the same name as the context element, and <xsl:element name="concat(name(.),'n')" /> to create an element of the same name as the context element, with the letter 'n' appended to it. Combining these facts should allow you to achieve the effect you desire.

---

Here is a complete solution. It is recommended to use the Muenchian method for grouping and not grouping based on count(preceding::*[someCondition]), which is grossly inefficient -- O(N^2).

This transformation:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:key name="kElsByName"
  match="/*/*" use="name()"/>

 <xsl:template match="/*">
   <SomeName>
     <xsl:for-each select=
      "*[generate-id()
        =
         generate-id(key('kElsByName', name())[1])
        ]
      ">

        <xsl:variable name="vsameNamedNodes" select=
         "key('kElsByName', name())"/>

        <xsl:variable name="vNumSameNamedNodes" select=
         "count($vsameNamedNodes)"/>

        <xsl:for-each select="$vsameNamedNodes">

         <xsl:element name="{concat(name(),
                             substring(position(),
                                       1 div ($vNumSameNamedNodes > 1)
                                       )
                                    )
                             }">
           <xsl:copy-of select="node()"/>
         </xsl:element>
       </xsl:for-each>
     </xsl:for-each>
   </SomeName>
 </xsl:template>
</xsl:stylesheet>

when applied on the provided XML document:

    <SomeName>
      <Node>
        DataA
     </Node>
     <Node>
        DataB
     </Node>
      <Node>
        DataC
     </Node>
      <AnotherNode>
        DataD
     </AnotherNode>
      <AnotherNode>
        DataE
     </AnotherNode>
      <AnotherNode>
        DataF
     </AnotherNode>
     <SingleNode>
        DataG
     </SingleNode>
   </SomeName>

produces the wanted result:

<SomeName>
    <Node1>
        DataA
    </Node1>
    <Node2>
        DataB
    </Node2>
    <Node3>
        DataC
    </Node3>
    <AnotherNode1>
        DataD
    </AnotherNode1>
    <AnotherNode2>
        DataE
    </AnotherNode2>
    <AnotherNode3>
        DataF
    </AnotherNode3>
    <SingleNode>
        DataG
    </SingleNode>
</SomeName>