On 26/04/2012 16:51, Michele R Combs wrote:
Hi all --
Can someone translate this into plain English for me?
<xsl:variable name="uniqueTypes"
select="ead/archdesc/dsc/descendant::*/container[not(@type=following::*/container/@type)]/@type"
/>
Roughly, it selects all the @type attributes provided there is no @type
attribute later in the document with the same value.
And it does this very inefficiently (n*2 performance where n is the
document size) - it can be done much more efficiently using keys.
It also doesn't do quite what I said. Assuming it's used with "/" as the
context item, It's actually looking for all @type attributes whose path
is /ead/archdesc/dsc//container, provided they aren't the same as a
following @type attribute whose path is //container. If there are @type
attributes that match the first path and not the second, that could lead
to some strange effects.
It could even select duplicates. If there happens to be a structure like
this:
<container type="x">
<container type="x"/>
</container>
then both type attributes will be selected, because the second is not
"following" the first.
Michael Kay
Saxonica
What exactly will this select? And (since it starts with the root node) will
it select the exact same thing no matter where it's used?
I thought I knew but it isn't behaving at all the way I expected.
Thanks --
Michele
+++++++++++++++
Michele Combs
Lead Archivist
Special Collections Research Center
Syracuse University
315-443-2081
mrrothen(_at_)syr(_dot_)edu
scrc.syr.edu
library-blog.syr.edu/scrc
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