GCO 1.2 is an XML Schema implementation derived from ISO 19103:2015, Geographic Information - Conceptual schema language. It includes utility elements for Geographic Common Objects. The XML schema was encoded using the rules described in ISO/TS 19139:2007.

The namespace URI for gco 1.2 is https://schemas.isotc211.org/19103/-/gco/1.2.

gco.xsd is the XML Schema document to be referenced by XML documents containing XML elements in the gco 1.2 namespace or by XML Schema documents importing the gco 1.2 namespace. This XML schema includes (indirectly) all the implemented concepts of the gco namespace, but it does not contain the declaration of any types.

baseTypes.xsd implements the UML conceptual schema defined in ISO 19103:2015, Geographic Information - Conceptual schema language. It was created using the encoding rules defined in ISO 19118, ISO 19139.

https://schemas.isotc211.org/19103/-/gco/1.2.0/baseTypes.xsd contains the following classes:

The cit 1.3 namespace imports these other namespaces:

When revisions to these schema become necessary, they will be managed in the ISO TC211 Git Repository.