<xsd:documentation>Defines the vertical datums associated with elevation, vertical depth
and measured depth coordinates within the context of a well. </xsd:documentation>
<xsd:appinfo>Modified-in-version=1.4.1, By-issue=W-CR-014, Change=Deleted-attribute:defaultMeasuredDepth</xsd:appinfo>
<xsd:appinfo>Modified-in-version=1.4.1, By-issue=W-CR-014, Change=Deleted-attribute:defaultVerticalDepth</xsd:appinfo>
<xsd:appinfo>Modified-in-version=1.4.1, By-issue=W-CR-014, Change=Deleted-attribute:defaultElevation</xsd:appinfo>
<xsd:appinfo>Modified-in-version=1.4.0, By-issue=1.3-48, Change=Modified-description</xsd:appinfo>
</xsd:annotation>