RE: [wsia][wsia-requirements][R413]

["Timothy N. Jones" <tim@crossweave.com>]

There is a concise scenario nicely describing the value of semantic
validation in the XForms intro chapter[1].  I see no reason not to include
the XForms binding constraint technology[2] as a recommendation along with
the Schema datatype constraint technology.

My only issue with R413 is that it's unclear whether #4 is necessary -- are
binding constraints not included in semantic constraints (#3)?

Tim

[1] http://www.w3.org/TR/2002/WD-xforms-20020118/slice2.html
[2] http://www.w3.org/TR/2002/WD-xforms-20020118/slice6.html

> I *think* I understand the intent but not necessarily the motivation.
> Are rich semantic descriptions of property values and relations a
> *requirement* or a "nice to have" feature of a particular API? I can see
> the value of having *human-readable* meta-information (aids the user of
> the Web Service). I can see the value of type constraints a-la Schema
> (mainly helping the Consumer map properties into programming
> constructs). Can anyone clarify the value of richer constraints? 
>  
> Or, maybe, can we perhaps define this requirement as open for
> extensibility, for example:
> This specification should permit the Producer to specify additional
> machine-readable semantic information regarding properties.
> ...which would lead to a construct such as Schema's <app-info>
> which
> allows arbitrary (but not specified) type constraints and information.
> -----Original Message-----
> From: Alan Kropp [mailto:akropp@epicentric.com] 
> Sent: Friday, May 03, 2002 9:10 PM
> To: 'wsia@lists.oasis-open.org'
> Subject: [wsia][wsia-requirements][R413]
> R413 [Expressiveness] 
>                 Producer properties should allow for the specification
> of 
> validation constraints and/or logic at each of the following levels: 
> 1.      lexical 
> 2.      syntactic 
> 3.      semantic 
> 4.      Constraints linking two property elements, defining how the
> value of 
> one may be computed from that of the other. Debate: CW, SR, AK, SF, SA.
> Also 
> 414-415 
>         Reword #4:  
>         By reference to the value(s) of one or more properties already 
> defined. 
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