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Is this correct: " A sequence of more than one item is

Subject: Is this correct: " A sequence of more than one item is not allowed as the first argument of dynamic function call "
From: "Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 14 Jun 2014 23:45:32 -0000
 Is this correct: " A sequence of more than one item is
 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.

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