Subject: RE: [xsl] String test pro's /con's From: "Michael Kay" <michael.h.kay@xxxxxxxxxxxx> Date: Mon, 24 Jun 2002 20:30:35 +0100 |
> To test if an element contains data (any string) what is the > difference/benefits/cons?? to either of the following: > > <xsl:if test="string-length(./myelement)> 0 ) > > or > > <xsl:if test="not(./myelement='')"> > Use the second. string-length() can be an expensive operation because of the need to scan the string looking for Unicode surrogate pairs. But of course, performance questions are always processor-dependent. Saxon optimizes the first expression to avoid scanning the string; other processors may have ways of storing strings that make it faster to look for surrogate pairs. Michael Kay Software AG home: Michael.H.Kay@xxxxxxxxxxxx work: Michael.Kay@xxxxxxxxxxxxxx XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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