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 $g is
bound to a function (reverse#1) that accepts multiple items, I think the
function coercion rules expect the call to satisfy the declared type.
Michael Kay
Saxonica
mike(_at_)saxonica(_dot_)com
+44 (0118) 946 5893
On 15 Jun 2014, at 00:45, Dimitre Novatchev dnovatchev(_at_)gmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
I have this transformation:
<xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="/">
<xsl:sequence select=
"function($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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