assigning sequence numbers to repeated tags.

Hi All

I have a sequence of tags, some repeating, in no particular order
<parenttag>
	<othertag/>
	<tag attrib="1"/>

	<tag attrib="2"/>
	<tag attrib="2"/>

	<tag attrib="3"/>
	<tag attrib="4"/>
	<tag attrib="4"/>
	<tag attrib="5"/>

	<tag attrib="2"/>

	<tag attrib="5"/>
	<tag attrib="5"/>
	<tag attrib="6"/>
</parenttag>

I need to loop through all repeated tags (with the same attrib number) and add a number reference to the attrib value.
e.g.
<parenttag>
	<othertag/>
	<tag attrib="1"/>

	<tag attrib="2"/>  =>  <tag attrib="2[1]"/>
	<tag attrib="2"/>  =>  <tag attrib="2[2]"/>

	<tag attrib="3"/>
	<tag attrib="4"/>
	<tag attrib="4"/>
	<tag attrib="5"/>

	<tag attrib="2"/>  =>  <tag attrib="2[3]"/>

	<tag attrib="5"/>
	<tag attrib="5"/>
	<tag attrib="6"/>
</parenttag>

Furthermore, I don't know the values of the attrib's in advance so I need the rule to use the attrib values found in the document.

Thanks in advance

Edward


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