Subject: Re: [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: Sun, 15 Jun 2014 00:38:16 -0000 |
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($x)) } So, please, disregard the previous message. However, the error message was and continues to be confusing. On Sat, Jun 14, 2014 at 4:45 PM, Dimitre Novatchev dnovatchev@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > I have this transformation: > > <xsl:stylesheet version="3.0" > xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> > <xsl:template match="/"> > <xsl:sequence select= > "function($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 > --------------------------------------- > 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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