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

Begin forwarded message:

From: Paul Trevithick <paul@xxxxxxxxxxxxx >
Date: January 7, 2008 3:13:12 PM EST
To: "Higgins (Trust Framework) Project developer discussions" <higgins-dev@xxxxxxxxxxx >
Cc: "Higgins (Trust Framework) Project developer discussions" <higgins-dev@xxxxxxxxxxx>
Subject: Re: [higgins-dev] Higgins data model for attribute values

Wrt the higgins data model all values must be of the same type. 

As for higgins.owl, I'm working on a rev that will address this and other related issues

On Jan 7, 2008, at 1:13 PM, Drummond Reed <drummond.reed@xxxxxxxxxxxx> wrote:

Good question, Jim. My assumption would have been that if an Attribute allows multiple values, they all would be of the same data type. Is there a use case for an Attribute having multiple values with different data types?


From: higgins-dev-bounces@xxxxxxxxxxx [mailto: higgins-dev-bounces@xxxxxxxxxxx] On Behalf Of Jim Sermersheim
Sent: Friday, January 04, 2008 6:20 PM
To: higgins-dev@xxxxxxxxxxx
Subject: [higgins-dev] Higgins data model for attribute values


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.  


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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