IETF RFC 3986 - URI

A Uniform Resource Identifier (URI) is a compact sequence of characters that identifies an abstract or physical resource. This specification defines the generic URI syntax and a process for resolving URI references that might be in relative form, along with guidelines and security considerations for the use of URIs on the Internet. The URI syntax defines a grammar that is a superset of all valid URIs, allowing an implementation to parse the common components of a URI reference without knowing the scheme-specific requirements of every possible identifier. This specification does not define a generative grammar for URIs; that task is performed by the individual specifications of each URI scheme.

USGIN Uniform Resource Identifier

Recommendations for usage and coining of Uniform Resource Identifiers (URI) in the U.S. Geoscience Information Network.

 

More links:

Data.gov URI discussion

Commentary on identifying wells

Discussion of concept identifier vs. document (representation) identifier

URL Design (Kyle Neath), and follow up from Jeni Tennison. Most of this discussion applies to any http URI.

UK data.gov guidance on creating URIs

IETF RFC 3986 - Universal Resource Identifier

A Uniform Resource Identifier (URI) is a compact sequence of characters that identifies an abstract or physical resource. This specification defines the generic URI syntax and a process for resolving URI references that might be in relative form, along with guidelines and security considerations for the use of URIs on the Internet. The URI syntax defines a grammar that is a superset of all valid URIs, allowing an implementation to parse the common components of a URI reference without knowing the scheme-specific requirements of every possible identifier. This specification does not define a generative grammar for URIs; that task is performed by the individual specifications of each URI scheme.

URI Venn Diagram
Relationship of URI to URL and URN ("Venn diagram of URI scheme," Wikipedia)

Standard
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