An indication of whether a  value can change between two released versions of the same  or .

Notes

• All released versions of the same  or  have the same id (field), but each version has a different  effective time (field). 
  • If a  is mutable (Mutable=YES), its value can differ from one version to the next without changing the identifier. 
  • If a  is immutable (Mutable=NO), its value must be the same in every version of a . To change the value associated with an immutable field, the existing  must be inactivated and a new  must be created to replace it. The new  must have a previously unused identifier. The field values are set to replace the inactivated concept with the updated information. 
• The mutability for each , in each type of release file, is indicated in the release file specification table for that component type or reference set.

Alternatives

• Mutable

Related Links

•  (opposite of mutable)
• Release File Specifications