Typically, OPC UA server uses namespaces from the OCP UA core, Companion Specifications and application specific namespaces. If it should be evident in the TD that different namepaces are used (e.g., visible by the uav:browseName or uav:browsePath terms), then these should be specified in the @context of the TD. The associated namespace index id should be associated as prefix value in the TD.

Example:

Lets assume there are namespaces used in a OPC UA server as described in the following nodeset:

If the Thing Description (TD) utilizes definitions from these namespaces, they should be specified within the TD @context with the corresponding namespace index as a prefix, as illustrated here: