<xsd:documentation>Information about a single wellbore.
A wellbore is a unique, oriented path from the bottom of a drilled
borehole to the surface of the Earth. The path must not overlap or cross itself. </xsd:documentation>
<xsd:documentation>Data object schema version. The fourth level must match the
version of the schema constraints (enumerations and XML loader files) that are assumed
by the document instance.</xsd:documentation>