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RE: get immediat preceeding node, if it is a comment

2002-10-07 13:38:34

Hi list, the newbie needs help again ;)

I have something like this:

<table name='table1' etc. etc.>
  <item name='col1' aggrtype="bit" aggrinfo="bit1,bit2,bit3"/>
  <item name="bit1" etc. etc./>
  <item name="bit2" etc. etc./>
  <item name="bit3" etc. etc./>
</table>

When my context node is <item name="bit1" ... /> I want to print the
aggrinfo (actually the number of bit names in aggrinfo, but I think I know
how
to do that, now) if and only if the node before bit1 has aggrtype="bit".
I figured this has to do with using the post below, but when I tried it
it gave me nothing. Here's my xsl:

<xsl:if
test="preceding-sibling::node()[normalize-space][1]/@aggrtype='bit'">
  <xsl:value-of
select="preceding-sibling::node()[normalize-space][1]/@aggrinfo"/>
</xsl:if>

What did I do wrong?

thanks!

J.L.

-----Original Message-----
From: Joerg Heinicke [mailto:joerg(_dot_)heinicke(_at_)gmx(_dot_)de]
Sent: Friday, October 04, 2002 7:57 AM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] get immediat preceeding node, if it is a comment




Andrew Welch wrote:
 preceding-sibling::node()[normalize-space()][1][self::comment()]

 This will select the first in a list of nodes that return true for
 normalize-space() and self::comment().

No, that would be

preceding-sibling::node()[normalize-space()][self::comment()][1]

What you have,
preceding-sibling::node()[normalize-space()][1][self::comment()]

selects the first non-whitespace-text node if it is a comment.


Sure.  But aren't they both the same (they select the same node)? The
only difference would be the size of the lists the predicates create?
(feel free to point out the correct terminology here)

Definitely no.

<root>
   <!--   test     -->
   <test1>test</test1>
   <test2>test</test2>
   <!--   test     -->
   <test3>test</test3>
   <test4>test</test4>
</root>

with context test4:

preceding-sibling::node() gets all other test elements and the comments and 
the whitespace only text nodes.

preceding-sibling::node()[normalize-space()] gets all other test elements 
and the comments.

preceding-sibling::node()[normalize-space()][1] gets test3.

preceding-sibling::node()[normalize-space()][1][self::comment()] gets 
nothing, because test3 isn't a comment.

preceding-sibling::node()[normalize-space()][self::comment()] gets all
comments.

preceding-sibling::node()[normalize-space()][self::comment()][1] gets the 
comment infront of test3.

But the original poster asked for immediately preceding comments. So only
preceding-sibling::node()[normalize-space()][1][self::comment()] is correct 
- with the danger of empty elements.

Regards,

Joerg

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