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## Re: [xsl] Why? A function that computes atomic values should use xsl:sequence rather than xsl:value-of

2020-03-31 08:57:27
```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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```
 Current Thread [xsl] Why? A function that computes atomic values should use xsl:sequence rather than xsl:value-of, Costello, Roger L. costello(_at_)mitre(_dot_)org Re: [xsl] Why? A function that computes atomic values should use xsl:sequence rather than xsl:value-of, Martin Honnen martin(_dot_)honnen(_at_)gmx(_dot_)de Re: [xsl] Why? A function that computes atomic values should use xsl:sequence rather than xsl:value-of, Graydon graydon(_at_)marost(_dot_)ca <= Re: [xsl] Why? A function that computes atomic values should use xsl:sequence rather than xsl:value-of, Michael Kay mike(_at_)saxonica(_dot_)com