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URI Current Status

This page summarizes the relationships among specifications, whether they are finished standards or drafts. Below, each title links to the most recent version of a document. For related introductory information, see: Identifiers.

Completed Work

W3C Recommendations have been reviewed by W3C Members, by software developers, and by other W3C groups and interested parties, and are endorsed by the Director as Web Standards. Learn more about the W3C Recommendation Track.

Group Notes are not standards and do not have the same level of W3C endorsement.

Group Notes


Usage Patterns For Client-Side URI parameters

This document is a placeholder to indicate that a document which had previously been a workding draft on the Recommendation Track is no longer being developed on the Recommendation Track. Instead, a TAG Finding has been published, based in part on the content of the working draft. The Finding is not on the Recommendation Track.


CURIE Syntax 1.0

This document defines a generic, abbreviated syntax for expressing URIs. This syntax is intended to be used as a common element by language designers. Target languages include, but are not limited to, XML languages. The intended audience for this document is Language designers, not the users of those Languages.


Cool URIs for the Semantic Web

The Resource Description Framework RDF allows users to describe both Web documents and concepts from the real world—people, organisations, topics, things—in a computer-processable way. Publishing such descriptions on the Web creates the Semantic Web. URIs (Uniform Resource Identifiers) are very important, providing both the core of the framework itself and the link between RDF and the Web. This document presents guidelines for their effective use. It discusses two strategies, called 303 URIs and hash URIs. It gives pointers to several Web sites that use these solutions, and briefly discusses why several other proposals have problems.


Legacy extended IRIs for XML resource identification


For historic reasons, some formats have allowed variants of IRIs that are somewhat less restricted in syntax, for example XML system identifiers and W3C XML Schema anyURIs. This document provides a definition and a name (Legacy Extended IRI or LEIRI) for these variants for easy reference.


URIs, URLs, and URNs: Clarifications and Recommendations 1.0

This paper addresses and attempts to clarify two issues pertaining to URIs, and presents recommendations. Section 1 addresses how URI space is partitioned and the relationship between URIs, URLs, and URNs. Section 2 describes how URI schemes and URN namespace ids are registered. Section 3 mentions additional unresolved issues not considered by this paper and section 4 presents recommendations.


TV Broadcast URI Schemes Requirements

This document is an informational document and discusses the requirements posed to URI schemes for identifying resources in Television (TV) Broadcast environments. The document is the outcome of discussions on this subject by the W3C TV-Web Interest Group [TVWebIG, TVWebMail].

Typical use cases are summarized where TV Broadcast URIs are involved. A distinction is made between Global and Local usage. Also, a hierarchy of resource types is identified. Requirements related to the Global usage case are listed.

Resources Developed Outside W3C

The following resources are relevant to this area of work.

RFC 3986

RFC 3986: Uniform Resource Identifier (URI): Generic Syntax defines URIs. Quoting from the RFC: "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."