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Re: [xsl] Is this correct: " A sequence of more than one item is not allowed as the first argument of dynamic function call "

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You declared $g to expect a single item as its argument, but in the call
$g($x), $x is bound to a sequence of more than one item. Even though $g is
bound to a function (reverse#1) that accepts multiple items, I think the
function coercion rules expect the call to satisfy the declared type.

Michael Kay
Saxonica
mike@xxxxxxxxxxxx
+44 (0118) 946 5893



On 15 Jun 2014, at 00:45, Dimitre Novatchev dnovatchev@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> I have this transformation:
>
> <xsl:stylesheet  version="3.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> <xsl:template match="/">
>   <xsl:sequence select=
>    "function($f as function(item()*) as item(),
>              $g as function(item()) as item()*,
>              $x as item()*
>              ) as item()*
>     { $f($g($x)) }
>          (head#1, reverse#1, ('H','e','l','l','o'))
>    "/>
> </xsl:template>
> </xsl:stylesheet>
>
> When I use BaseX to evaluate the XPath 3.0 expression that is
> specified in the "select" attribute of the <xsl:sequence> above, I get
> the expected, correct result:
>
>            "o".
>
> However, when I run this transformation with the Saxon-EE 9.5.1.3 from
> within Oxygen, I get this error:
>
> Severity: fatal
> Description: XPTY0004: A sequence of more than one item is not allowed
> as the first argument of dynamic function call ("H", "e", ...)
> URL: http://www.w3.org/TR/xpath20/#ERRXPTY0004
>
> I have never heard of any such limitation before, haven't seen such a
> rule in any specification and cannot find any reasons for such
> limitation.
>
> Could someone, please, explain if this behavior is a bug, or not? If
> this is correct behavior, what is the rationale behind this
> limitation?
>
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
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> ---------------------------------------
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