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Re: Strawman for 0..n entity ids [WAS: [higgins-dev] Myposition onEntityId]
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How is an entity resolvable w/o some reference to the context to which the entityID belongs anyway? That is, I've understood that we're trying to say:
1. ContextID + EntityID is a globally unique, fully qualified identifier.
2. An immutable #1 is usable in relationships.
Tom
>>> Anthony Nadalin <drsecure@xxxxxxxxxx> 09/18/08 10:58 PM >>>
So to further qualify the EntityID is not an Identifier and not an attribute. The entityID may be fully qualified that is may have a referwnce to the context thus can resolve with out a contextID
-----------------
Sent from my BlackBerry Handheld.
----- Original Message -----
From: "Drummond Reed" [drummond.reed@xxxxxxxxxxxx]
Sent: 09/18/2008 09:11 PM MST
To: "'Higgins (Trust Framework) Project developer discussions'" <higgins-dev@xxxxxxxxxxx>
Cc: <higgins-dev-bounces@xxxxxxxxxxx>
Subject: RE: Strawman for 0..n entity ids [WAS: [higgins-dev] My position onEntityId]
Tony, I think everyone's on board that an EntityId represents a reference to
exactly one Entity in a context. Now its about cardinality, immutability,
and type. Regarding the first two, the current proposal is that if
cardinality is 0..n, the IEntity.getEntityIds() method will return all of
them (whether exposed as attributes or not), and the proposed
IEntity.getCanonicalEntityId() method will return only the single EntityId
specified in that context to be: a) canonical, b) immutable. If the context
does not support either canonical immutable IDs, the
IEntity.getCanonicalEntityId() method will return an error.
If there's agreement on that, then it's just down to the types returned by
those methods and accepted by IContext.getEntity().
=Drummond
_____
From: higgins-dev-bounces@xxxxxxxxxxx
[mailto:higgins-dev-bounces@xxxxxxxxxxx] On Behalf Of Anthony Nadalin
Sent: Thursday, September 18, 2008 10:34 AM
To: Higgins (Trust Framework) Project developer discussions
Cc: Higgins (Trust Framework) Project developer discussions;
higgins-dev-bounces@xxxxxxxxxxx
Subject: Re: Strawman for 0..n entity ids [WAS: [higgins-dev] My position
onEntityId]
Depends, no one is stating what an EntityID represents, my view is it
resolves to the Entity within a context
Anthony Nadalin | Work 512.838.0085 | Cell 512.289.4122
Inactive hide details for "Markus Sabadello" ---09/18/2008 12:30:56
PM---After the call, I had this idea:"Markus Sabadello" ---09/18/2008
12:30:56 PM---After the call, I had this idea:
From:
"Markus Sabadello" <msabadello@xxxxxxxxxxxxx>
To:
"Higgins (Trust Framework) Project developer discussions"
<higgins-dev@xxxxxxxxxxx>
Date:
09/18/2008 12:30 PM
Subject:
Re: Strawman for 0..n entity ids [WAS: [higgins-dev] My position on
EntityId]
_____
After the call, I had this idea:
1. Let's say IEntity.getEntityIds() returns an array of Objects (in Java:
Object[]). These Objects can either be Strings or IAttributeValues. If the
EntityId is not exposed as an attribute, it's just a String. If it is
exposed as an attribute, then it's an IAttributeValue.
2. IEntity.getCanonicalEntityId() returns a single Object. As before, if the
canonical EntityId is not exposed as an attribute, then the Object is a
String. Otherwise it's an IAttributeValue.
3. IContext.getEntity() has two overloaded versions. One that takes a
String, and one that takes an IAttributeValue.
So in total:
public Object[] IEntityId.getEntityIds(); // Objects can either be String or
IAttributeValue
public Object IEntity.getCanonicalEntityId(); // Object can either be String
or IAttributeValue
public IEntity IContext.getEntity(String);
public IEntity IContext.getEntity(IAttributeValue);
You don't invent something new for typing such as key-value pairs. You
simply use the existing IAttributeValue interface. IAttributeValue already
includes the type. And it can be complex, so you can do multi-part keys too.
All the IAttributeValue instances returned by IEntityId.getEntityIds() are
guaranteed to also show up somewhere on the IEntity in an IAttribute that is
a sub-attribute of higgins:synonym.
Would that work?
Markus
