3.3 Data Object Reference

In previous versions of WITSML, relationships between objects were a key component of object identify and were defined through an XML hierarchy or tree structure. For example: a log was identified uniquely in the context of a wellbore and its parent well.

Now that top-level objects are identified by UUID, relationships between objects are specified using a data object reference (DOR), a mechanism that allows any top-level object to reference another by its UUID. A log object now has a UUID and a DOR to its parent wellbore; the wellbore has a DOR to its parent well.

For more information, see the Energistics Identifier Specification.