W3C home > Mailing lists > Public > public-xml-processing-model-wg@w3.org > June 2007

Re: Cardinality of inputs

From: Innovimax SARL <innovimax@gmail.com>
Date: Fri, 22 Jun 2007 01:08:36 +0200
Message-ID: <546c6c1c0706211608k3bc4b781oedb8a4401af01d51@mail.gmail.com>
To: "Norman Walsh" <ndw@nwalsh.com>
Cc: public-xml-processing-model-wg@w3.org

On 6/21/07, Norman Walsh <ndw@nwalsh.com> wrote:
> / "Innovimax SARL" <innovimax@gmail.com> was heard to say:
> | On 6/7/07, Norman Walsh <ndw@nwalsh.com> wrote:
> |> Right now, we have support for 1 or 0-or-more documents as input.
> |> What's missing is support for 1-or-more and 0-or-1.
> |>
> |> I can think of some reasons for 0-or-1 (an optional configuration
> |> input, for example), but I can't think of any uses for 1-or-more.
> |
> | 0-or-1 is already in use in the spec : look at p:option/p:parameter
> | but since zero is authorized, why an empty sequence wouldn't be
> | authorized here ?
>
> Options, parameters, (and xpath-context and viewport-source) are
> special cases. You can't declare an atomic step such that it takes 0
> or 1 documents on an "ordinary" input port. You can only say 1 or 0 or
> more.
>
> You can pass an empty sequence to p:option and p:parameter. You can
> pass an empty sequence to p:xpath-context too, but your expression
> better return an empty node set. A p:viewport-source does require
> exactly one document.

Even with a p:pipe element pointing to an empty sequence ?

>
> |> With that in mind, does anyone want to advance arguments for change
> |> in this part of the spec?
> |
> | some DTD like
> |
> | (nothing) or cardinality=""      1-1
> | cardinality="*"                      0-or-more
> | cardinality="?"                      0-or-1
> | cardinality="+"                     1-or-more
>
> Yes, we could do that. I'd like to think of something more
> user-friendly than "cardinality".
>
> And are you arguing that we should do this, or only that we could?

could....


-- 
Innovimax SARL
Consulting, Training & XML Development
9, impasse des Orteaux
75020 Paris
Tel : +33 8 72 475787
Fax : +33 1 4356 1746
http://www.innovimax.fr
RCS Paris 488.018.631
SARL au capital de 10.000 
Received on Thursday, 21 June 2007 23:08:44 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 8 January 2008 14:21:53 GMT