Subject: Re: [xsl] shortest way to write this xsl:if statement From: Andrew Welch <andrew.j.welch@xxxxxxxxx> Date: Fri, 15 Jun 2012 14:22:13 +0100 |
> = as Ken has very patiently described is an existential quantifier. If > you want regular equality testing use eq. > > There are two categories of XPath comparators. General comparison > operators like = that do existential quantification and value > comparison operators like eq that compare atomic values. One thing to be aware of is you have to be careful when using eq when the sequence type is xs:boolean, for example: <xsl:variable name="foo" select="/aaa eq '123'" as="xs:boolean"/> will fail with an exception if /aaa returns the empty sequence. However: <xsl:variable name="foo" select="/aaa = '123'" as="xs:boolean"/> ...will succeed as when you use = if either side is the empty sequence it returns false, and not () -- Andrew Welch http://andrewjwelch.com
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