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A variable has Access control, it has a name, and a type.
| Access access | access | 
| string name | name | 
| string type | type | 
| VarRW::Id id | id | 
| Variable (const string& n, const string& t, Access a,
		 VarRW::Id i) | Variable | 
| Variable (const Variable& v) | Variable | 
| bool  writable () | writable | 
[const]
| bool  operator== (const Variable& other) | operator== | 
[const]