Internet Engineering Task Force (IETF) J. Gregorio
Request for Comments: 6570 Google
Category: Standards Track R. Fielding
ISSN: 2070-1721 Adobe
M. Hadley
MITRE
M. Nottingham
Rackspace
D. Orchard
Salesforce.com
March 2012
URI Template
Abstract
A URI Template is a compact sequence of characters for describing a
range of Uniform Resource Identifiers through variable expansion.
This specification defines the URI Template syntax and the process
for expanding a URI Template into a URI reference, along with
guidelines for the use of URI Templates on the Internet.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6570.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
Gregorio, et al. Standards Track [Page 1]RFC 6570 URI Template March 2012
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................3
1.1. Overview ...................................................3
1.2. Levels and Expression Types ................................5
1.3. Design Considerations ......................................9
1.4. Limitations ...............................................10
1.5. Notational Conventions ....................................11
1.6. Character Encoding and Unicode Normalization ..............12
2. Syntax .........................................................13
2.1. Literals ..................................................13
2.2. Expressions ...............................................13
2.3. Variables .................................................14
2.4. Value Modifiers ...........................................15
2.4.1. Prefix Values ......................................15
2.4.2. Composite Values ...................................16
3. Expansion ......................................................18
3.1. Literal Expansion .........................................18
3.2. Expression Expansion ......................................18
3.2.1. Variable Expansion .................................19
3.2.2. Simple String Expansion: {var} .....................21
3.2.3. Reserved Expansion: {+var} .........................22
3.2.4. Fragment Expansion: {#var} .........................23
3.2.5. Label Expansion with Dot-Prefix: {.var} ............24
3.2.6. Path Segment Expansion: {/var} .....................24
3.2.7. Path-Style Parameter Expansion: {;var} .............25
3.2.8. Form-Style Query Expansion: {?var} .................26
3.2.9. Form-Style Query Continuation: {&var} ..............27
4. Security Considerations ........................................27
5. Acknowledgments ................................................28
6. References .....................................................28
6.1. Normative References ......................................28
6.2. Informative References ....................................29
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