GML overview
Simple Features – Level 1
The Geography Markup Language (GML) data conforms to GML Simple Features Profile Level 1. In this release of the product, the only thing that does not conform to level 0 is the inspireId.
The geometries that we use are OGC ‘simple’: points, and line strings with linear interpolation.
Schemas
XML schemas are used to define and validate the format and content of the GML. The GML 3.2.1 specification provides a set of schemas that define the GML feature constructs and geometric types. These are designed to be used as a basis for building application-specific schemas, which define the data content.
The Ordnance Survey application schema waterNetwork.xsd, which is referenced by the data, is available on our website. It imports the INSPIRE Hydrography networks application schema, which in turn imports the GML 3.2.1 schemas. These in turn import schemas produced by the W3C. The data contains elements and attributes from a range of namespaces:
The XML namespaces used by the application schema and their definitions.
Namespace identifier | Short form prefix | Application schema |
---|---|---|
water | OS MasterMap Water Network Layer | |
urn:x-inspire:specification:gmlas:HydroNetwork:3.0 | hy-n | INSPIRE Hydrography networks |
urn:x-inspire:specification:gmlas:Network:3.2 | net | INSPIRE generic network |
urn:x-inspire:specification:gmlas:BaseTypes:3.2 | base | INSPIRE base types |
gml | OGC GML 3.2.1 | |
xlink | W3C XML Linking | |
xsi | W3C XML Schema instance |
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