- OpenGIS® Standards
- Catalogue Service
- CityGML
- Coordinate Transformation
- Filter Encoding
- Geographic Objects
- Geography Markup Language
- Geospatial eXtensible Access Control Markup Language (GeoXACML)
- GML in JPEG 2000
- Grid Coverage Service
- KML
- Location Services (OpenLS)
- Observations and Measurements
- Sensor Model Language
- Sensor Observation Service
- Sensor Planning Service
- Simple Features
- Simple Features CORBA
- Simple Features OLE/COM
- Simple Features SQL
- Styled Layer Descriptor
- Symbology Encoding
- Transducer Markup Language
- Web Coverage Service
- Web Feature Service
- Web Map Context
- Web Map Service
- Web Processing Service
- Web Service Common
- Specification Profiles
- Abstract Specification
- OpenGIS® Reference Model
- GeoDRM Reference Model
- Best Practices
- Discussion Papers
- Deprecated Documents
- Retired Documents
- Requests (RFP's, RFQ's...)
- White Papers
- Change Requests
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
3) Official Schemas
http://schemas.opengis.net/gml/
Note: You may also download All Official OGC Schemas in a single zip file.
4) Related News
Updated: 2008-11-05 20:17:10 EST