BackItems?

This assumes that each data element ( variable/attribute ) has a number of descriptive values that can be compared ( to determine applicability ) to an operation.

• identifier the name
• type the type it represents
• organisation the overlying set organisation
• mutability whether the value can be modified or not

eg ... fred has been declared as a part of the "fruitbat" namespace, it's an integer it's a solitary integer and is immutable with the value 3 thus :

• variable (fruitbat:fred:int:single:imm:3)

so the "++" postfix operator will not be able to operate on it as it's immutable.