Geography Markup Language

OpenGIS Geography Markup Language (GML) Encoding Standard

1) Overview
2) Downloads
3) Official Schemas
4) Related News

1) Overview

The OpenGIS® Geography Markup Language Encoding Standard (GML) The Geography Markup Language (GML) is an XML grammar for expressing geographical features. GML serves as a modeling language for geographic systems as well as an open interchange format for geographic transactions on the Internet. As with most XML based grammars, there are two parts to the grammar – the schema that describes the document and the instance document that contains the actual data. A GML document is described using a GML Schema. This allows users and developers to describe generic geographic data sets that contain points, lines and polygons. However, the developers of GML envision communities working to define community-specific application schemas [en.wikipedia.org/wiki/GML_Application_Schemas] that are specialized extensions of GML. Using application schemas, users can refer to roads, highways, and bridges instead of points, lines and polygons. If everyone in a community agrees to use the same schemas they can exchange data easily and be sure that a road is still a road when they view it. Clients and servers with interfaces that implement the OpenGIS® Web Feature Service Interface Standard[http://www.opengeospatial.org/standards/wfs] read and write GML data. GML is also an ISO standard (ISO 19136:2007) [www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32554 ]. See also the GML pages on OGC Network: http://www.ogcnetwork.net/gml .

2) Downloads

Version	Document Title (click to download)	Document #	Type
3.2.1	OpenGIS Geography Markup Language (GML) Encoding Standard	07-036	IS
	Revision Notes for OpenGIS® Implementation Specification: Geographic information - Geography Markup Language Version 3.2.1 (3.2.1)	07-061	Notes
	OGC® OWS-5 Engineering Report: Local MSD Implementation Profile (GML 3.2.1) (0.0.2)	08-077	DP
	Technical Committee Policies and Procedures: MIME Media Types for GML (1.0.0)	09-144r1	POL
3.1.1	OpenGIS Geography Markup Language (GML) Encoding Specification	03-105r1	D-BP
	City Geography Markup Language (0.4.0)	07-062	D-BP
	City Geography Markup Language (0.3.0)	06-057r1	D-DP
	GML 3.1.1 common CRSs profile (1.0.0)	05-095r1	Profile
	GML 3.1.1 common CRSs profile Corrigendum (1.0.1)	06-113	PC
	GML 3.1.1 CRS support profile (1.0.0)	05-094r1	Profile
	GML Application Schema for EO Products (0.9.0)	06-080r2	D-BP
	GML Application Schema for EO Products (0.1.4)	06-080r1	D-DP
	GML Application Schema for EO Products (0.1.1)	06-080	D-DP
	GML 3.1.1 grid CRSs profile (1.0.0)	05-096r1	Profile
	GML 3.1.1 grid CRSs Profile Corrigendum (1.0.1)	06-111	PC
	GML PIDF-LO Geometry Shape Application Schema for use in the IETF (0.1.0)	06-142r1	BP
	GML 3.1.1 simple dictionary profile (1.0.0)	05-099r2	Profile
	GML 3.1.1 simple features profile (1.0.0)	06-049r1	Profile
3.0	OpenGIS Geography Markup Language (GML) Encoding Specification	02-023r4	D-IS
2.1.2	Geography Markup Language	02-069	D-IS
	Corrigendum 1 (one) for OpenGIS Implementation Specification GML 2.1.2 (0.0.1)	06-189	D-ISC
2.1.1	Geography Markup Language	02-009	D-IS
2.0	Geography Markup Language	01-029	D-RP
1.0	Geography Markup Language	00-029	D-RP
0.0.5	OWS3 GML Topology Investigation	05-102r1	DP
1.0.0	GML Performance Investigations by CubeWerx	05-050	DP
0.0.4	OWS 3 GML Investigations - Performance Experiment by Galdos Systems	05-101	DP
1.0.0	OpenGIS GML in JPEG 2000 for Geographic Imagery Encoding Specification	05-047r3	IS
0.3.0	GML in JPEG 2000 for Geographic Imagery	05-047r2	D-RFC
0.4	GML Point Profile	05-029r4	DP
0.0.19	GML simple features profile	05-033r9	D-RFC
0.3.0	OWS-6 GML Profile Validation Tool ER	09-038r1	PER