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<xsd:documentation>The gravity based elevation coordinate of this point
as measured from a datum. Positive moving upward from the elevation datum. </xsd:documentation>
<xsd:documentation>The measured depth coordinate of this reference point.
Positive moving toward the bottomhole from the measured depth datum.
This should be given when the reference is "downhole", such as an ocean
bottom template, or when the reference point is also used as a vertical well datum.
The measured depth value can be used to determine if the reference point
and a vertical well datum are at the same point.</xsd:documentation>