GssPolicies/InumberResolution

I-Number Resolution

Motivation
Global Personal I-Number Resolution Policy
Global Organizational I-Number Resolution Policy
Global Independent I-Number Resolution Policy
Primary Community I-Number Policy
I-Number Cross-Resolution Policy
Implications

Community I-Numbers
Multiple Community I-Numbers

Related Policies

1. Motivation

These policies specify how Global I-Numbers are resolved. They are motivated by the need to:

Enable persistent identification of a Resource regardless of changes over time to the Resource's Global I-Name(s), Registrar, I-Broker(s), or any other registration data.
Provide maximum resolution efficiency of Global I-Numbers for all users and service providers of XDI infrastructure.
Protect the privacy of Global I-Number Registrants and provide them with maximum control over the data associated with their Global I-Number.
Protect the security and integrity of XDI infrastructure.

2. Global Personal I-Number Resolution Policy

A Global Personal I-Number MUST resolve to at least one Community I-Number and MAY resolve to more than one Community I-Number. This Community I-Number SHOULD be a Cross-Reference to the Global Personal I-Number under the Global Independent I-Number of the I-Broker.

3. Global Organizational I-Number Resolution Policy

A Global Organizational I-Number MUST resolve to at least one Community I-Number and MAY resolve to more than one Community I-Number. This Community I-Number SHOULD be a Cross-Reference to the Global Organizational I-Number under the Global Independent I-Number of the I-Broker.

4. Global Independent I-Number Resolution Policy

A Global Independent I-Number MUST resolve to at least one URI. It MAY resolve to more than one URI.

5. Primary Community I-Number Policy

If a Global I-Name resolves to more than one Community I-Number, the Registrant MUST indicate which Community I-Number shall be the primary resolution value.

6. I-Number Cross-Resolution Policy

Resolution of a Global I-Number MUST return all associated Global I-Numbers and Community I-Numbers.

7. Implications

7.1. Community I-Numbers

For the Registrant of a Global I-Number, the Community I-Number that reveals the least information is simply a Cross-Reference to the Registrant's Global I-Number under the target I-Broker. This is the recommended best practice.

Examples:

Global i-number:        xri://=!(!1234!5678!ABCD)
Community i-number:     xri://!!1000/(=!(!1234!5678!ABCD))
Global i-number:        xri://@!(!A1B2!7272!9876!CDEF)
Community i-number:     xri://!!1000/(@!(!A1B2!7272!9876!CDEF))

7.2. Multiple Community I-Numbers

A Registrant may wish to resolve a Global I-Number into more than one Community I-Number, for example to maintain a primary and secondary account at different I-Brokers for redundancy. For this reason Registrars should give Registrants the choice of whether to associate more than one account with a Global I-Number registration.

8. Related Policies

I-Number Syntax – GssPolicies/InumberSyntax.
I-Number Transfer - GssPolicies/InumberTransfer.