<xsd:documentation>A reference to a trajectoryStation in a wellbore.
The trajectoryStation may be defined within the context of another wellbore.
This value represents a foreign key from one element to another.</xsd:documentation>
<xsd:documentation>A pointer to the trajectoryStation within the parent trajectory.
This is a special case where we only use a uid for the pointer.
The natural identity of a station is its physical characteristics (e.g., md).</xsd:documentation>