version is optional (EPSG DATASBASE VERSION)RFC5165srsName (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/ogcna