XPath exists function is a good solution. It returns true if the value 
is not an empty sequence.

https://www.w3.org/TR/xpath-functions-31/#func-exists

Best regards,
Christophe

Le 18/09/2022 C  10:05, Mukul Gandhi mukulg@xxxxxxxxxxxxxxxxx a C)critB :
> Hi Mark,
>
> On Wed, 31 Aug, 2022, 06:57 Mark Giffin m1879@xxxxxxxxxxxxx, 
> <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>     XSLT 2.0, Saxon processor.
>
>     What's a good way to check if a variable has a value? I want to
>     print something if a variable has a value, and not print it if it
>     is not given a value. This must be extremely simple but I don't
>     see it.
>
>
> I think, we can simply compare XSLT 2.0+ variable's value with an 
> empty sequence.
>
> i.e somthing like below,
>
> <xsl:if test="not(deep-equals($var, ()))">
> B  B  <xsl:copy-of select="$var"/>
> </xsl:if>
>
> (this will output the contents of variable to XSLT result tree, which 
> the XSLT serializer could serialize to an XML fragment instance for 
> example)
>
> or,
>
> <xsl:if test="not(deep-equals($var, ()))">
> B  B  <xsl: value-of select="diagnostic message"/>
> </xsl:if>
>
>
> --
> Regards,
> Mukul Gandhi
>
>
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