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

Subject: [xsl] 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
 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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