For all problems involving looking for duplicates, or grouping, use
Muenchian grouping in XSLT 1.0 or xsl:for-each-group in 2.0.

It's a little hard from this problem description to see how it would
extrapolate to different input files. For example, what output would you
want if the input were:

> <a>
>    <b>Value1</b>
>    <bb>Value2</bb>
>    <bbb>Value3</bbb>
> </a>
> <c>
>    <b>Value1</b>
>    <bb>Value4</bb>
>    <bbb>Value5</bbb>
> </c>

or if it were:

> <c>
>    <b>Value4</b>
>    <bb>Value2</bb>
>    <bbb>Value5</bbb>
> </c> 
> <a>
>    <b>Value1</b>
>    <bb>Value2</bb>
>    <bbb>Value3</bbb>
> </a>

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: Jonathan Marenus [mailto:jonathanmarenus@xxxxxxxxx] 
> Sent: 18 July 2005 11:07
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Outputing Differences between two files
> 
> 
> I'm trying to write an XSL that receives an XML file
> as input and outputs only the values that have a
> certain sibling's value duplicated in the file.  For
> example, if I have the following XML:
> 
> <a>
>    <b>Value1</b>
>    <bb>Value2</bb>
>    <bbb>Value3</bbb>
> </a>
> <c>
>    <b>Value4</b>
>    <bb>Value2</bb>
>    <bbb>Value5</bbb>
> </c>
> 
> In this example, I want the output sibling to be
> "a/bbb".  Since "Value2" is shown twice for element
> bb, I want to output "Value3", since that is the
> output sibling.  Any feedback regarding this example
> would be appreciated, so that I can apply it to my
> actual situation.
> 
> Thanks.
> 
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