Re: [xsl] Why? A function that computes atomic values should use xsl:seq

On Tue, Mar 31, 2020 at 01:40:19PM -0000, Costello, Roger L. 
costello(_at_)mitre(_dot_)org scripsit:
> Hi Folks,
>
> I have a function that returns a xs:boolean. I used xs:value-of to return the 
> value. Saxon 9.9.1.5 gives this warning message:
>
>       A function that computes atomic values 
>       should use xsl:sequence rather than
>       xsl:value-of
>
> Why?
>
> Why should a function use xsl:sequence?
xsl:value-of returns a text node.

xsl:sequence returns what it has, which at least has the possibility of
being an atomic value in a function that computes atomic values.

So while things work via implicit type conversion, you're getting a
warning to tell you that you're making the optimizer work hard for no
obvious purpose.

-- Graydon
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