Subject: RE: Selecting similar XML nodes by a sort criteria
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Fri, 05 Oct 2007 16:06:37 -0400
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Harsh,
At 12:36 PM 10/5/2007, you wrote:
Another question.
In your code, you have this line:
<xsl:template match="pile">
<xsl:for-each
select="item[generate-id()=generate-id(key('item-by-number',@number)[1])
]">
What is the significance of [1] in the generate-id() function call?
As a positional predicate, it filters out all but the first (in
document order) of the nodes selected in the node set it operates on.
Strictly speaking, in XSLT 1.0 you don't need it, since generate-id()
will operate on the first node in the set in any case. But it avoids
an error running under XSLT 2.0, so it's a good habit always to write
it. Also, it's a tiny bit more legible to a reader who knows that the
key will return several nodes, but not that generate-id() will
operate only on the first (under XSLT 1.0).
Cheers,
Wendell
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Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc. http://www.mulberrytech.com
17 West Jefferson Street Direct Phone: 301/315-9635
Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
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