The product is supplied in GML version 3.2.1. This sub-section describes how OS Open Greenspace is defined in GML. An understanding of XML (eXtensible Mark-up Language) and XML schemas is required.
GML is an XML grammar for expressing geographic features. GML serves as a modelling language for geographic systems, as well as an open interchange format for geographic transactions on the Internet. More information can be found on the 'Geography Markup Language' page of the Open Geospatial Consortium (OGC) website.
The XML specifications that GML is based on are available from the World Wide Web Consortium (W3C) website.
Information about Unicode and UTF-8 (the character encoding we use) is available on the Unicode Consortium website.
The examples in this section that mention specific data content are for demonstration purposes only and not intended for use.
XML schemas are used to define and validate the format and content of the GML. The GML version 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 to define the data content.
The Ordnance Survey application schema, OSOpenGreenspace.xsd, which is referenced by the data, is available on the 'OS Open' page of the 'XML file resources' section of our website.
The product's two code lists are available at the following links:
Function Value Code List: http://www.os.uk/xml/codelists/OpenFunctionValue.xml
Access Type Value Code List: http://www.os.uk/xml/codelists/AccessTypeValue.xml
OS Open Greenspace is supplied as an Esri shapefile. Shapefile is an open specification file format to store geometry and attribute information about spatial features. It is developed and regulated by Esri for data interoperability among Esri and other geographic information systems (GIS) software products.
