[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: The specification of the standard function fold-le
On Sat, Jun 21, 2014 at 11:08 PM, Wolfgang Laun wolfgang.laun@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: >> "As a consequence of the function signature and the function calling >> rules, a type error occurs if the supplied function $f cannot be >> applied to two arguments, where the first argument is either the value >> of $zero or the result of a previous application of $f, and the second >> is $seq or any trailing subsequence of $seq" >> >> The signature of the function fold-left is specified as: >> >> fn:fold-left($seq as item()*, >> $zero as item()*, >> $f as function(item()*, item()) as item()*) as item()* >> >> The above quoted paragraph violates the signature, because the >> argument $f, as specified cannot have as its second argument a >> sequence -- the type of the second argument of $f must be item(). But >> the above quoted paragraph says "...the second is $seq or any trailing >> subsequence of $seq". > > Since each call of $f is done with fn:head($seq), and the restriction > defined here refers to the second argument of fn:fold-left I see no > problem with this text. The issue is that by definition the second argument of $f is of type item() -- this means that $f cannot accept as its second argument "$seq or any trailing subsequence of $seq". And you are referring to the XQuery and XSLT code published in the "Rules" section -- this code is correct. The issue is with the text of the "Error Conditions" section -- more precisely, the end of the sentence. -- 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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