GML
From Seamonster
- Data main page
- SQL Server
- Visualization, Photosynth, Time Lapse Videos, Chart Director, Virtual Globes, Virtual Earth, Google Earth
- XML, SensorML, GML, KML
- Web Services
- Geoserver, PostGIS
Introduction
GML is an evolving OGC standard markup language. Here is a page with links to the evolving specifications. From the most current (11/2007) version:
Geography Markup Language is an XML grammar written in XML Schema for the description of application schemas as well as the transport and storage of geographic information.
The key concepts used by Geography Markup Language (GML) to model the world are drawn from the ISO 19100 series of International Standards and the OpenGIS Abstract Specification.
A feature is an abstraction of real world phenomena(ISO 19101); it is a geographic feature if it is associated with a location relative to the Earth. So a digital representation of the real world may be thought of as a set of features. The state of a feature is defined by a set of properties, where each property may be thought of as a {name, type, value} triple.
From OGC's GML standards document, version 3.2.1
