| Documentation |
Type describing the reference to an corresponding object in an other
information system, for example in the german cadastre ALKIS, the german topographic
information system or ATKIS, or the Ordnance Survey Mastermap. The reference consists of
the name of the external information system, represented by an URI, and the
reference of the external object, given either by a string or by an URI.
If the informationSystem element is missing in the ExternalReference,
the ExternalObjectReference must be an URI, which contains an indication
of the informationSystem.
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