specifies if and how the given values can be tailored by a lower level BREX data
module. The attribute can have one of the following values:
- "restrictable" - a
BREX at a lower level can impose further restrictions to the given value by changing
the
textual interpretation to reflect that restriction
- "lexical" - a BREX at a lower
level can adjust the text string constituting the interpretation, however, only in
respects that do not in any way change the conceptual and semantic meaning of the
interpretation
- "closed" (D) - a BREX at a lower level must not in any way restrict
or alter the interpretation of a value declared at this level