Broaden LOCATABLE_REF.as_uri() to allow URIs referring to any health data
LOCATABLE_REF.as_uri() should be relaxed to accommodate non-ehr uri schema (for DEMOGRAPHIC PARTY.reverse_relationship)
Limited - this function is probably not widely implemented. Where it is, the change would be relatively simple.
Changed the explanation of the function, see https://specifications.openehr.org/releases/BASE/latest/base_types.html#_locatable_ref_class
This will probably require further improvement as part of a larger CR on formalising paths and URIs.