[Biojava-dev] cardinalities on AnnotationType & PropertyConstraint

[Schreiber, Mark]

I don't think ZERO is needed at all except in the case of ZERO_OR_ONE.

-Mark

> -----Original Message-----
> From: Thomas Down [mailto:td2@sanger.ac.uk] 
> Sent: Friday, 1 November 2002 6:07 a.m.
> To: Matthew Pocock
> Cc: Biojava-dev@biojava.org
> Subject: Re: [Biojava-dev] cardinalities on AnnotationType & 
> PropertyConstraint
> 
> 
> On Thu, Oct 31, 2002 at 04:21:46PM +0000, Matthew Pocock wrote:
> > I've made some changes to the AnnotationType and PropertyConstraint
> > classes. We now have a class CardinalityConstraint that 
> lets us say how 
> > many values we expect to see associated with a property in 
> an annotation 
> > bundle. There are some common values - ZERO, ONE, 
> ZERO_OR_ONE, ANY, and 
> > you can make new ones (e.g. 4..4, 12..15, 1..2) if they help you.
> 
> This is good to have.
> 
> I think we need to clarify the semantics a little, though.
> Do we distinguish between properties which exist with 
> cardinality 0 (which is possibly in the current Annotation 
> interface, if the value is a Collection of size zero), and 
> properties which are undefined.
> 
> I guess defined properties with zero cardinality are useful
> as flags.  But that feels like a bit of a hack, since you 
> could equally well have a property of datatype boolean, 
> cardinality EXACTLY_ONE.  
> 
> Any thoughts?
> 
>     Thomas.
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