My confusion came when I was trying to the value 'IsCJKUnifiedIdeographs' in a
variable and reference this in an attribute value template.
If I store 'IsCJKUnifiedIdeographs' in the variable 'UnicodeCharBlock'
\p{{{$UnicodeCharBlock}}} seems to work.
If I understand you correctly the innermost {} flags the AVT, the outermost
ones are the actual braces required for this expression. Are the middle ones to
process the results of the first AVT within a second AVT?
----------------------------------------
Date: Fri, 29 May 2009 07:50:00 -0400
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
From: gkholman(_at_)CraneSoftwrights(_dot_)com
Subject: RE: [xsl] Unicode character blocks in strings
At 2009-05-29 12:46 +0100, tom tom wrote:
I don't understand why the regex \p{{IsCJKUnifiedIdeographs}}
contains a double '{}' structure. Why doesn't \p{IsCJKUnifiedIdeographs} work?
Because the value of the regex= attribute is an attribute value template.
In an attribute value template, the single brace is a signal to
perform a "value-of" instruction with the contents as the value of
the select= expression.
Since you need actual brace brackets in the attribute, you need to
double them up in order to escape the attribute value template parsing.
This happens a lot when writing XSLT stylesheets that create Ant
scripts (a very useful design pattern).
I hope this helps.
. . . . . . . . . . . . Ken
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