At 2004-11-17 12:10 -0800, mark_fletcher(_at_)peoplesoft(_dot_)com wrote:
I'm having a problem pulling distinct nodes out of some xml with duplicate
values at multiple levels.
I find that variable-based grouping is far more effective for
multiple-level distinction because key-based grouping is always working in
document-wide scope.
In all cases, I want to get the data from the
last node of a set that shares duplicate values. (This xml will be in a
file that gets appended to multiple times. So I can assume that the last
tags are the most current.)
Fine.
In the xml below, what I'm trying to do is get a list of distinct book/code
values from the last prodline where name=PL1.
I'm assuming, though, that you'd want to do this for each of your product
lines.
But I'm having no luck getting a list of distinct book/code values from
this particular prodline. I've tried creating keys and using the Meunchian
method of comparing generate-id() values, but to no avail. Any help would
be greatly appreciated!
I suggest not using the Meunchian method because of its document scope and
to use the variable-based method because you can then work within a
selected scope. If you Google for variable-based grouping you'll find a
number of examples I've posted of doing grouping within a limited scope.
A working solution to your problem is below.
I hope this helps.
.................. Ken
t:\ftemp>type mark.xml
<prodlines>
<prodline>
<name>Product Line 1</name>
<code>PL1</code>
<product>
<name>Product 1</name>
<code>P1</code>
<book>
<name>Book 1</name>
<code>B1</code>
</book>
<book>
<name>Book 2</name>
<code>B2</code>
</book>
</product>
<product>
<name>Product 2</name>
<code>P2</code>
<book>
<name>Book 1</name>
<code>B1</code>
</book>
<book>
<name>Book 3</name>
<code>B3</code>
</book>
<book>
<name>Book 4</name>
<code>B4</code>
</book>
</product>
</prodline>
<prodline>
<name>Product Line 2</name>
<code>PL2</code>
<product>
<name>Product 1</name>
<code>P1</code>
<book>
<name>Book 1</name>
<code>B1</code>
</book>
</product>
</prodline>
<prodline>
<name>Product Line 1 (ver 2)</name>
<code>PL1</code>
<product>
<name>Product 1</name>
<code>P1</code>
<book>
<name>Book 1</name>
<code>B1</code>
</book>
<book>
<name>Book 2</name>
<code>B2</code>
</book>
<book>
<name>Book 5</name>
<code>B5</code>
</book>
</product>
<product>
<name>Product 2</name>
<code>P2</code>
<book>
<name>Book 1</name>
<code>B1</code>
</book>
<book>
<name>Book 2</name>
<code>B2</code>
</book>
<book>
<name>Book 3</name>
<code>B3</code>
</book>
<book>
<name>Book 4</name>
<code>B4</code>
</book>
</product>
</prodline>
</prodlines>
t:\ftemp>type mark.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:for-each select="/prodlines/prodline">
<xsl:variable name="bookcodes" select="product/book"/>
Product line: <xsl:value-of select="name"/>
<xsl:for-each select="$bookcodes">
<xsl:if test="generate-id(.)=
generate-id($bookcodes[name=current()/name and
code=current()/code])">
<!--hit the first of each unique group-->
<xsl:for-each select="$bookcodes[name=current()/name and
code=current()/code][last()]">
Last book/code in product: <xsl:value-of
select="concat(name,'/',code,' in ', ../name)"/>
<xsl:text>
</xsl:text>
</xsl:for-each>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
t:\ftemp>saxon mark.xml mark.xsl
Product line: Product Line 1
Last book/code in product: Book 1/B1 in Product 2
Last book/code in product: Book 2/B2 in Product 1
Last book/code in product: Book 3/B3 in Product 2
Last book/code in product: Book 4/B4 in Product 2
Product line: Product Line 2
Last book/code in product: Book 1/B1 in Product 1
Product line: Product Line 1 (ver 2)
Last book/code in product: Book 1/B1 in Product 2
Last book/code in product: Book 2/B2 in Product 2
Last book/code in product: Book 5/B5 in Product 1
Last book/code in product: Book 3/B3 in Product 2
Last book/code in product: Book 4/B4 in Product 2
t:\ftemp>rem Done!
--
World-wide on-site corporate, govt. & user group XML/XSL training.
G. Ken Holman mailto:gkholman(_at_)CraneSoftwrights(_dot_)com
Crane Softwrights Ltd. http://www.CraneSoftwrights.com/s/
Box 266, Kars, Ontario CANADA K0A-2E0 +1(613)489-0999 (F:-0995)
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