Knowledge · Framework · Core · protocol

Attribute

Define a value-typed property that references a type entity and binds to parent lifecycle

Definition

An Attribute is a value-typed property of an entity. Attributes describe data that an entity OWNS — properties identified by value, not by identity. Attributes differ from sub-entities in the IDENTITY PRINCIPLE: Attribute: value semantics, parent lifecycle, sidebar display Entity: identity semantics, own lifecycle scope, graph node Both attributes and sub-entities reference Entity instances by name as their type.

Standards

  • OMG MOF 2.5.1 — Property
  • OMG MOF 2.5.1 — DataType
  • Domain-Driven Design — Value Object

Knowledge References

  • value-object pattern
  • entity-pattern pattern
  • meaningful-names standard

Schema Preview (5 fields)

  • type string — Reference an Entity name that serves as this attribute's classifier
  • purpose string — Explain why this attribute exists on the parent entity
  • required boolean — Indicate whether this attribute must have a value