I have found that the original code really suffer from a type error.
It seems that until we have generics in XPath, it wouldn't be
possible to write a strongly-typed definition of function-composition.
For now, I don't see a generic definition, more precise than this:
function($f as function(*),
$g as function(*),
$x as item()*
) as item()*
{ $f($g($x)) }
So, please, disregard the previous message.
However, the error message was and continues to be confusing.
On Sat, Jun 14, 2014 at 4:45 PM, Dimitre Novatchev
dnovatchev(_at_)gmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
I have this transformation:
<xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="/">
<xsl:sequence select=
"function($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
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.
--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.
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