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Difference between revisions of "UDI"
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== Description == | == Description == | ||
| − | * [[UDI]]s identifiy [[Context]]s, [[Entity | Entities]] and [[ | + | * [[UDI]]s identifiy [[Context]]s, [[Entity | Entities]] and [[Attribute]] s |
| − | * A [[UDI]] is a kind of | + | * A [[UDI]] is a kind of URI |
* [[ContextId]] and [[EntityId]] [[Attribute]]s are [[UDI]]s. | * [[ContextId]] and [[EntityId]] [[Attribute]]s are [[UDI]]s. | ||
* Two broad classes of [[UDI]]s will be supported in Higgins 1.1: | * Two broad classes of [[UDI]]s will be supported in Higgins 1.1: | ||
Revision as of 20:51, 27 April 2008
{{#eclipseproject:technology.higgins}}
Version
This page describes the concept of UDI as used in the Context Data Model 1.1.
Description
- UDIs identifiy Contexts, Entities and Attribute s
- A UDI is a kind of URI
- ContextId and EntityId Attributes are UDIs.
- Two broad classes of UDIs will be supported in Higgins 1.1:
- OpenID URIs that resolve to an XRDS document (OpenID 2.0 only)
- HTTP URIs or XRIs that resolve to an XRDS document containing a Higgins Service Endpoint. This endpoint holds the necessary metadata to access Higgins Contexts and Entities using a variety of protocols.
- Semantic Web Linked Data HTTP Cool URIs (probably only the '303' redirect variant)
- Some UDIs are global —they can be resolved to an object from anywhere on the internet
- Objects identified with global UDIs can be interconnected together to form a global, distributed object graph called the HGG
- Other UDIs are local — they can only be resolved within a LAN or perhaps on the local machine
- Objects identified by local UDIs cannot be a part of the Global Graph