Jeff,
JP may have another word of explanation but I can throw some stuff in.
Two things that you may already know, but we have to be clear on to avoid
misconceiving the problem:
* equality testing rules for node-sets -- in the XSLT spec at
w3.org/TR/xpath -- two node-sets test as equal if either node set contains
any node with the same (string) value as any node in the other node set.
So ". = ../listing" tests true if the context node of the expression has
the same value as any node in the set "../listing".
* "../listing" is short for "parent::node()/child::listing". If the context
node is a listing element, this will always test as true, since the context
node itself is among the listing children of its parent. (Also defined in
the XPath Rec.)
If you want to test whether a node has the same value as any of its
siblings (not the same as the children of its parent, which category of
course includes itself), you can test ". = (preceding-sibling::* |
following-sibling::*)" (or perhaps (preceding-sibling::listing |
following-sibling::listing) in your case).
At 12:23 PM 11/26/2003, you wrote:
I thought the were going to be equal because they are part of the same
context. Is there a way to compare the pair-wise unequal $unique-rooms to
say an a sibling node with similar data?
Depends on what you mean by "pair-wise", but yes.
Is context part of the select
statement? If I select //topics/topic/location am I in the location
context, if so can I compare "." to //topics/place/room data?
Sure -- it compares the string value of the context node to the string
values of all the nodes in //topics/place/room (and tests true if any are
the same).
Notice however in your example that if you iterate over $unique-rooms, the
context is no longer what it is outside the for-each - inside it, "."
refers to each of the nodes in $unique-rooms as it is processed. The
workaround for this is to bind your node of interest to a variable outside
the for-each, and test against that:
<xsl:variable name="here" select="."/>
<xsl:variable name="unique-rooms"
select="//topics/topic/location[not(. =
preceding::location)]" />
<xsl:for-each select="$unique-rooms">
<xsl:if test="../location = $here">
...
Cheers,
Wendell
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Wendell Piez
mailto:wapiez(_at_)mulberrytech(_dot_)com
Mulberry Technologies, Inc. http://www.mulberrytech.com
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Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
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