Cart
[Home] [By Thread] [By Date] [Recent Entries]
Hi,
At 04:07 PM 8/19/2010, Liam wrote: On Thu, 2010-08-19 at 12:58 -0500, a kusa wrote: > Hi > > Is there any way in XSLT to check if the value between two nodes is a > whitespace? > > I tried normalize-space(product/text()) !=' ' but that is not working. > I want tocheck if the actual value between <product> </product> is a > white space. Problems relating to "whitespace" are more often underspecified than not. XML has a definition of "white space" (any space, carriage return, line feed or tab character or run of such characters), but whether your definition in your problem aligns exactly with XML's is a different question. And even if it does, there are often other questions. For example, in the problem statement here, what does "a white space" mean? By one reasonable reading it matches "^\s$", while another has it match "^\s+$" as Liam suggests. (Other readings allow strings that match neither.) Does a run of whitespace characters count as "a white space"? Dimitre's XPath 1.0 solution, "product/text() and not(normalize-space(product/text())", works with the second of these definitions, since a run of whitespace is collapsed by normalize-space() into an empty string (and then coerced to Boolean false). That is, the test is refactored to (a) the text node exists (the 'product' element is not empty), but (b) it has no value other than whitespace characters. For the first definition, one might want translate(product/text(),'
	',' ')=' ' (in XPath 1.0). This turns any LF or TAB into a space, then sees if the resulting string is a single space. (Ordinarily one doesn't have to worry about CR since it has already been normalized by a parser. But even this isn't always so.) Cheers, Wendell ====================================================================== 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 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ======================================================================
|
