[xsl] Eliminating Duplicates - With sets of attributes defining uniqueness

["Thimmegowda, Balaji" <balaji_thimmegowda@xxxxxxxxx>]

Hi,

Consider the following XML :

<Book>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter2"
free="no"/>
	<Chapter Desc="Desc2" sample="sample2" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter1"
free="yes"/>
</Book>
<Book>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc2" sample="sample2" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc1" sample="sample1" ID="ID1" name="chapter1"
free="no"/>
	<Chapter Desc="Desc1" sample="sample1" ID="ID2" name="chapter1"
free="no"/>
</Book>

The attributes "ID", "name" and "free" are the ones that I need to check
for uniqueness.
The combination of each of this attribute with the attributes, "Desc"
and "sample", makes it unique.

For instance :
When the attribute is "ID", a combination of "Desc","sample" and "ID"
has to be unique within the current "Book" element.
When the attribute is "name", a combination of "Desc","sample" and
"name" has to be unique within the current "Book" element.
When the attribute is "free", a combination of "Desc","sample" and
"free" has to be unique within the current "Book" element.

So, the output from the 1st Book element should be as follows :

Output from 1st Chapter element
<res>Desc1_sample1_ID1</res>
<res>Desc1_sample1_chapter1</res>
<res>Desc1_sample1_no</res>

Output from the 2nd Chapter element
<res>Desc1_sample1_chapter2</res>

Output from the 3rd Chapter element
<res>Desc2_sample2_ID1</res>
<res>Desc2_sample2_chapter1</res>
<res>Desc2_sample2_no</res>

Output from the 4th Chapter element
NONE - Since its a duplicate

Output from the 5th Chapter element
<res>Desc1_sample1_yes</res>

The output from the 2nd Book element should be as follows :

Output from the 1st Chapter element
<res>Desc1_sample1_ID1</res>
<res>Desc1_sample1_chapter1</res>
<res>Desc1_sample1_no</res>

Output from the 2nd Chapter element
NONE - Since its a duplicate

Output from the 3rd Chapter element
<res>Desc2_sample2_ID1</res>
<res>Desc2_sample2_chapter1</res>
<res>Desc2_sample2_no</res>

Output from the 4th Chapter element
NONE - Since its a duplicate

Output from the 5th Chapter element
<res>Desc1_sample1_ID2</res>

I have tried out a few stylesheets and I was able to eliminate the
duplicates by considering all the attributes within the "Chapter"
elements. But, I am not able to get it to work the way I have mentioned
here.

Any help is greatly appreciated.

Thanks in advance,
BT.


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