version is optional (EPSG DATASBASE VERSION) srsName (current EPSG CRS definitions): urn:ogc:def:crs:EPSG:\d{4,5} - Main.rmartell - 02 Oct 2007 OGC Urn PolicyBack to OGC Naming Authority. This page is available publicly and to Member's only. The OGC URN scheme is defined in the OGC Document: 07-107r1 - the IETF RFC that defines the ogc:urn scheme, for IANA registration.https://www.ogc.org/ogcUrnPolicyOGC Naming AuthorityURN Resolver Tool Public URN Policy URN Policy Documents URN Register Register OGC Naming Authority Sub Committee URN Namespace Proposal (see below) A URN namespace for the Open Geospatial Consortium (OGC) Abstract This document describes a URN (Uniform Resource Name) namespace that is engineered by the Open Geospatial Consortium (OGC) for naming persistent resources publishedhttps://www.ogc.org/ogcnaRFC 5165RFC 5165 - A Uniform Resource Name (URN) Namespace for the Open Geospatial Consortium (OGC)Network Working Group C. Reed Request for Comments: 5165 Open Geospatial Consortium Category: Informational April 2008 A Uniform Resource Name (URN) Namespace for the Open Geospatial Consortium (OGC) Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind.https://datatracker.ietf.org/doc/html/rfc5165