<xsd:documentation>The measured depth at a point or at the top of an interval.
If it represents the top of an interval then bottom measured depth must also be given.
At least one of dTime or mdTop must be given.</xsd:documentation>
<xsd:documentation>A textual parameter value. This value is typically annotation on the log.
All spaces, tabs, line feeds and carriage returns are retained in the string.
Characters representing line breaks should be replaced by a line feed or carriage return.</xsd:documentation>