i think using lists is a cleaner solution in general On Mon, 17 Aug 2009 21:28:27 +0100 Axel Polleres <axel.polleres@deri.org> wrote: > Hi all, > > While working on the all-builtins use case, I realize a slight > error/problem in DTB now with the function: > > func:string-join(...) > > its xpath/xquery counterpart fn:string-join(...) > > takes two arguments: > - a sequence of strings > - a "separator" string > > now I realize - since this function was introduced when we didn't heva > lists in RIF yet, that we seem to have expected a "flattened" list as > input, i.e. we give the schemas > > ( ?arg1 ?arg2; func:string-join(?arg1 ?arg2 ) ) > > ( ?arg1 ?arg2 ?arg3; func:string-join(?arg1 ?arg2 ?arg3 ) ) > > ... > > ( ?arg1 ?arg2 ... ?argn; func:string-join(?arg1 ?arg2 ... ?argn ) ) > > > Anyways, the semantics is defined in terms of fn:string-join, which > didn't work so far, but only works with a small fix, i.e. interpreting > the first n-1 arguments as the sequence argument of the CPAth/Xquery > fn:string-join function. "Historically" this is IMO what we meant, as > there was no lists. > > Thus, I see two options for fixing this: > > a) stick with the flattened version, interpreting the first n-1 > arguments as the sequence argument of the CPAth/Xquery fn:string-join > function and the last argument as the separator string. > > b) make the function with a fixed arity of 2, the domain of the first > argument being a list of strings and the second argument the separator > string. > > I implemented option a) now, since it is the "least intrusive" change to > the current doc, see > > http://www.w3.org/2005/rules/wiki/index.php?title=DTB&diff=10665&oldid=10495 > > however, b) seems somehow the more natural way to proceed. The > disadvantage/worry I see with b) is that we might want to implement > "emulating" sequences by lists as input in other functions as well... > Opinions? > > Axel > > >Received on Monday, 17 August 2009 20:53:22 UTC
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