D-Net

	extensions 100 to 199;

	optional string sitename = 1; // source

	optional string label = 2; // title

	optional string url = 3; // text()

	optional string description = 4; // ?? not mapped yet ??

	optional Qualifier qualifier = 5; // type

	optional string refidentifier = 6; // site internal identifier

	optional string query = 7; // maps the oaf:reference/@query attribute

	optional DataInfo dataInfo = 8; // ExternalReferences might be also inferred