Language Usage Codes
Internally defined codes useful throughout the specification where Concept is used. These are defined by the code system "rfh" which has OID [todo].
| expressed | Person can express themselves in this language |
| received | Person can understand this language |
| signed | use of sign language |
| spoken | Can speak |
| written | Can read/write |
| poor | |
| fair | |
| proficient |
ToDo: mode and proficiency are linked...
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