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Support empty dADL blocks

Description

The current grammar doesn't seem to support object block without any attributes. It's needed to support instances that have no values, the mere existence of the instance is enough, e.g. PARTY_SELF from the openEHR RM.

An example (from ADL document):

profile = (DESTINATION_PROFILE) <>

Status

Assignee

Unassigned

Reporter

Rong Chen

Raised By

Rong Chen

Priority

Minor