Subject: Re: [xsl] Selecting from a sequence From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 5 Feb 2015 18:36:35 -0000 |
If $a and $b have cardinality zero-or-one then ($a, $b)[1] does what you want (and is a common programming idiom). But be careful, it doesn't work if either $a or $b can contain more than one item. Also, it tests whether $a exists, which isn't the same as your example of testing the effective boolean value of string(@a). Michael Kay Saxonica mike@xxxxxxxxxxxx +44 (0) 118 946 5893 On 5 Feb 2015, at 18:32, Mailing Lists Mail daktapaal@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hey All, > I have a logic that says : > > if $a found , then use it, else use $b. > I can do this like > > <xsl:value-of select = "if(string($a)) then $a else $b"/> > > Can I do something like > <xsl:value-of select = "($a,$b)[1]"/> > > Not sure , when this will work and when it wont. Or will it work at all..
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