Specifications
URN Specifications
Every PubID maps to a canonical URN (Uniform Resource Name) for machine interchange. These specifications define the URN namespaces for each standards publisher.
Published Specifications
| Specification | Namespace ID | Status |
|---|---|---|
| ISO URN Specification (RFC 5141-bis) | urn:iso:std: |
Supersedes RFC 5141 |
| IEC URN Specification | urn:iec:std: |
Based on IEC URI Model (2020) |
Reference Documents
- RFC 5141 — A URN Namespace for ISO (original, superseded by RFC 5141-bis)
- RFC 2141 — URN Syntax
About These Specifications
These URN specifications are maintained as part of the PubID project. Each specification defines:
- The ABNF grammar for the Namespace Specific String (NSS)
- Element descriptions for each URN component
- Examples covering basic identifiers, supplements, stages, and languages
- Uniqueness and persistence considerations
- Resolution mechanisms
- Gap analysis against prior specifications (where applicable)
The specifications are authored in AsciiDoc and rendered on this site using Asciidoctor. Source files are available in the PubID repository.
Implementation
The PubID Ruby library implements URN generation and parsing for all supported publishers:
require 'pubid'
id = Pubid::Iso.parse("ISO 9001:2015")id.to_urn # => "urn:iso:std:iso:9001:ed-5:en"
id = Pubid::Iec.parse("IEC 61131-3:2013")id.to_urn # => "urn:iec:std:iec:61131:-3:ed-3"