Abstract head of the substitution group for observation systems: a system of zonesor regions associated with a sampling feature or sample, each assigned a singleclass of qualitative description, for example lithology, color or discontinuity.
Database handle for the object. It is of XML type ID, so is constrained to beunique in the XML document within which it occurs. An external identifier for the object inthe form of a URI may be constructed using standard XML and XPointer methods. This is doneby concatenating the URI for the document, a fragment separator, and the value of the idattribute.
Source
<element abstract="true" name="AbstractObservationSystem" type="diggs:AbstractObservationSystemType"><annotation><documentation>Abstract head of the substitution group for observation systems: a system of zones or regions associated with a sampling feature or sample, each assigned a single class of qualitative description, for example lithology, color or discontinuity.</documentation></annotation></element>