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Re: [higgins-dev] Higgins data model for attribute values

higgins-dev-bounces@xxxxxxxxxxx wrote on 01/04/2008 09:19:47 PM:

> Before addressing bug #190594, I need to know more about what the
> Higgins data model allows in an attribute's instance data.
>
> In IdAS, my understanding is that a Digital Subject may have 0..1
> occurrence of a particular Attribute, and that an Attribute may have
> 1..N occurrences of a particular type of Value.

In the case of an Attribute X, I would like to better understand the
semantic intended by the difference between the two cases where:
a) there is 0 occurence of X,,
b) there is 1 occurence of X with 0 values.
Is there a difference? What is it?

If this model changed to allow 0..N occurence of an Attribute, with 1
occurence of Value for each Attribute, what would be the difference?

If this model changed to allow 1 occurence of an Attribute, with 0..N
occurence of Value for each Attribute, what would be the difference?

> It's my understanding that each of an Attribute's values must be of
> the same data type, but that restriction isn't obvious to me in the
> Higgins OWL, and in fact, the opposite is reflected in the IdAS
> APIs.  In IdAS, one can state the data type of each value they add
> to an attribute.
>
> So, we need to agree on the Higgins data model regarding the types
> of attribute values.  Should the Higgins data model dictate that
> they all be of the same type, or should it allow their types to be mixed?

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