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Subject: RE: Status of the OpenGIS Geography Markup Language (GML).
Dear TC -
At last Tuesday's GIS SC conference call, the group asked that I provide an
update on the current status of the Geography Markup Language. Below the bullets
is a short description of GML extracted from the GML document.
Hope this helps!
Carl
What is GML? GML "is an XML grammar written in XML Schema for the modeling,
transport, and storage of geographic information; it provides a variety of kinds
of objects for describing geography including features, coordinate reference
systems, geometry, topology, time, units of measure and generalized values. New
additions in GML 3.x include support for complex geometries, spatial and
temporal reference systems, topology, units of measure, metadata, gridded data,
and default styles for feature and coverage visualization. The GML 3.x modular
structure means that developers choosing to use GML can literally pick out the
schemas or schema components that apply to their work. GML 3.x also includes a
sample packaging tool that creates a tailored schema containing only the
required components from the GML core schemas. The normative parts of the
specification use the W3C XML Schema language to describe the grammar of
conformant GML instances. The specification also uses the Recommended XML
encoding of Coordinate Reference System definitions prepared by the CRS WG
of OGC.
Carl Reed, PhD
CTO and Executive Director Specification Program OGC The OGC: Helping the World to Communicate Geographically
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