Subject: Re: [xsl] check for whitespace value between nodes From: Dimitre Novatchev <dnovatchev@xxxxxxxxx> Date: Fri, 20 Aug 2010 13:33:30 -0700 |
On Fri, Aug 20, 2010 at 1:02 PM, Wendell Piez <wapiez@xxxxxxxxxxxxxxxx> wrote: > Dear Dimitre, > > At 12:00 PM 8/20/2010, you wrote: >> >> In fact the expression I proposed also covers your "first definition". > > Of course -- I'm sorry if I wasn't clear that a single space character would > pass your test. But it doesn't do so exclusively. If "a white space" is > meant to designate *only* a single character, the test (as you know) has to > be tighter. And either way, we also get to worry about what that character > can be. Space, tab, non-breaking space, zero-width space ... The question said "white space". Not "white space character". Also in your message you were describing the solution to your "first case" as: "For the first definition, one might want translate(product/text(),'
	',' ')=' ' " So, it seems that your "first case" defines whitespace as containing one or more newline and tab characters. There is nothing in your proposed XPath expression that restricts the test for "*only* a single character". Once again, the XPath expression I came up with fully covers this case. -- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play > >> Do note that there is only a single definition for whitespace in the >> XML Recommendation (http://www.w3.org/TR/REC-xml/#sec-common-syn) : >> >> [3] B B S B B ::= B B (#x20 | #x9 | #xD | #xA)+ >> >> and this is exactly what the normalize-space() function handles >> (http://www.w3.org/TR/xpath-functions/#func-normalize-space): >> >> "Summary: Returns the value of $arg with whitespace normalized by >> stripping leading and trailing whitespace and replacing sequences of >> one or more than one whitespace character with a single space, #x20. >> >> The whitespace characters are defined in the metasymbol S (Production >> 3) of [Extensible Markup Language (XML) 1.0 Recommendation (Third >> Edition)]." > > Certainly. (And I know you know I know this. :-) > > My point (as I know you know) is that problem statements relating to > whitespace in transformations -- or XML processing in general -- often do > not make reference to this spec. In fact, they are often given without any > awareness that such a definition exists. (The list archive will show this > time and time again.) > > Cheers, > Wendell > > > ====================================================================== > Wendell Piez B B B B B B B B B B B B B B mailto:wapiez@xxxxxxxxxxxxxxxx > Mulberry Technologies, Inc. B B B B B B B B http://www.mulberrytech.com > 17 West Jefferson Street B B B B B B B B B B Direct Phone: 301/315-9635 > Suite 207 B B B B B B B B B B B B B B B B B B B B B Phone: 301/315-9631 > Rockville, MD B 20850 B B B B B B B B B B B B B B B B Fax: 301/315-8285 > ---------------------------------------------------------------------- > B Mulberry Technologies: A Consultancy Specializing in SGML and XML > ======================================================================
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