The nsid (namespace identifier) type creates a context in which namespace identifiers can be bound.
# fncreate -t nsid org/sales/site/alameda.bldg-5/
creates the nsid context for the site alameda.bldg-5 and permits the creation of subcontexts such as service/. Continuing with this example, you could then execute the command
# fncreate -t service org/sales/site/alameda.bldg-5/service/
to create the service context for alameda.bldg-5.
The nsid context created is owned by the administrator who ran the fncreate command.