gml:OperationParameterPropertyType is a property type for association roles to an operation parameter, either referencing or containing the definition of that parameter.
<complexType name="OperationParameterPropertyType"><annotation><documentation>gml:OperationParameterPropertyType is a property type for association roles to an operation parameter, either referencing or containing the definition of that parameter.</documentation></annotation><sequence minOccurs="0"><element ref="gml:OperationParameter"/></sequence><attributeGroup ref="gml:AssociationAttributeGroup"/></complexType>