fheader = administrative information about the feature.
Fclass contains feature classification data, e.g. populated place, river, etc., usually drawn from a standard thesaurus/ontology. Fcode contains a feature code, which may or may not be based on feature location, place in a hierarchy, etc. Fclass and fcode are probably only useful when the gazetteer is designed to stand alone; that is, when a sequential list of features will suffice without placing the features in a hierarchical arrangement. When a hierarchical arrangement is desired,
the data contained in fclass and fcode should not be included in the gazetteer proper, but placed instead in a separate XML structure, e.g. a gdms document,
which contains references to feature IDs. The authority element is provided in order to document the source from which the feature was taken.