Subject: Re: Boolean true() and false() as strings? From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx> Date: Thu, 05 Oct 2000 17:41:34 +0100 |
John-- It's not the boolean test that's coercing $units_gt_300 to a string ... it's the original <xsl:value-of select="true()"/> -- or false() -- that creates it.... "The xsl:value-of element is instantiated to create a text node in the result tree. The required select attribute is an expression; this expression is evaluated and the resulting object is converted to a string as if by a call to the string() function." [XSLT 7.6.1] Note this is different from saying <xsl:variable name="units_gt_300" select="true()"/> where the assigned value is the Boolean. Obscure little corners of the spec.... Cheers, Wendell At 04:17 PM 10/5/00 -0400, you wrote: >A curious thing (well, to me!)... consider this template rule: > ><xsl:template match="sales"> > <h2>Regions Selling More than 300 Units:</h2> > <xsl:for-each select="region"> > <xsl:variable name="units_gt_300"> > <xsl:choose> > <xsl:when test="number(units) > 300"> > <xsl:value-of select="true()"/> > </xsl:when> > <xsl:otherwise> > <xsl:value-of select="false()"/> > </xsl:otherwise> > </xsl:choose> > </xsl:variable> > <xsl:if test="$units_gt_300='true'"> > <h3><xsl:value-of select="concat(@name, ' (', units, ' units)')"/></h3> > </xsl:if> > </xsl:for-each> ></xsl:template> > >Note the assignment of Boolean true() or false() to the variable, and the ><xsl:if> test. Why can't the latter be simply: > > <xsl:if test="$units_gt_300"> > >i.e., why the need to test vs. the string value "true"? Does using the >true() and false() functions in a variable coerce their return values to >string type rather than their "native" Boolean? ====================================================================== 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 ====================================================================== XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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