gml:SingleCRSPropertyType is a property type for association roles to a single coordinate reference system, either referencing or containing the definition of that coordinate reference system.
<complexType name="SingleCRSPropertyType"><annotation><documentation>gml:SingleCRSPropertyType is a property type for association roles to a single coordinate reference system, either referencing or containing the definition of that coordinate reference system.</documentation></annotation><sequence minOccurs="0"><element ref="gml:AbstractSingleCRS"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>