Event data is created during business processes. MasterData is additional data that provides context for interpreting the event data.

BizStep and bizLocation are URNs that are known to the MasterData server which may provide additional information.
Master Data can provide additional properties for traceable objects through a couple of mechanisms:
- If a localId/EPCs matches a TDT pattern it will be transformed into a MasterData key and queried.
- An entity type can have an itemRef which will apply to all entities of that type, and the itemRef will be converted to a Master Data key and queried.
Current matching TDT patterns.
urn:gtnet:id:sgtin:([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)
urn:epc:id:sgtin:([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)
urn:gtnet:id:gssi:([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)
urn:gtnet:id:gsli:([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)
urn:gtnet:id:gsii:([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)\.([a-zA-Z0-9\-\_]*)