OGC Seeks Comment on Geography Markup Language 3.3 Standard

Please note: This Request is closed. The documents listed below have been adopted by the OGC Technical and Planning Committee. These specifications are under control of the Standards Working Group and will be released after the edits and revisions. For the most current version please check our Standards Page.

The Open Geospatial Consortium (OGC®) seeks public comment on the candidate version 3.3 of the OGC Geography Markup Language (GML). GML 3.3 builds on GML 3.2.1, published by ISO as ISO 19136:2007, and extends GML with additional schema components based on requirements requested by various domains of interest. For example, the 3d modeling community suggest the addition of triangular meshes (TINs) to GML. GML 3.3 is fully backwards compatible with GML 3.2.

GML defines an XML data encoding for geographic data and a grammar to express models of such data using XML Schema. GML has come into wide use since it was first adopted as an OGC standard in 2001 (http://www.ogcnetwork.net/gmlprofiles for examples). GML is the standard that enables information communities and other standards organizations such as the Internet Engineering Task Force (IETF) and OASIS to insert geospatial elements into their standards and be confident that their standards will be compatible with mainstream information infrastructure methods of conveying spatial/temporal information.

Some of the changes between the previous version 3.2.1 and 3.3 are:

  • Support for additional date representations based on ISO 8601 (Representation of dates and times)
  • Support for an additional, compact encoding of commonly used geometry types
  • Support for a new encoding of Triangulated Irregular Networks (TINs)
  • Support for Linear Referencing
  • Extensions to the XML encoding rule
  • Support for grids used by the meteorological and ocean observation communities

All extensions are made in separate XML namespaces to support a modular use of components from the GML schema.

Information on the change requests addressed in GML v3.3 can be found athttp://external.opengeospatial.org/twiki_public/GML/ChangeRequests. The candidate OGC GML v3.3 Standard documents are available for review and comment below.


Comments can be submitted to a dedicated email reflector for a thirty day period ending on the "Close request date" listed above, Comments received will be consolidated and reviewed by OGC members for incorporation into the document. Please submit your comments using the following link: requests [at] lists.opengeospatial.org (Click here to submit comments) The link provided above should include a standard template in the message body. If the preloaded message body does not work properly using your mail client, please refer to the following template for the message body: Comments Template


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