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

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?

I don't recall ever seeing that warning before. Is this something new?

/Roger
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