Post:
  actAs:              [ Timestampable, Sortable ]
  columns:
    title:            { type: string(255), notnull: true, unique: true }
    excerpt:          { type: string(800) }
    body:             { type: clob, extra: markdown }
    image_id:         { type: integer }
  relations:
    Image:
      class:          DmMedia
      local:          image_id

Comment:
  actAs:              [ Timestampable ]
  columns:
    post_id:          { type: integer, notnull: true }
    author:           { type: string(255), notnull: true }
    body:             { type: clob }
  relations:
    Post:
      foreignAlias:   Comments
      onDelete:       CASCADE

Category:
  columns:
    name:             { type: string(255), notnull: true }
    body:             { type: clob, extra: markdown }

Product:
  columns:
    category_id:      { type: integer, notnull: true }
    name:             { type: string(255), notnull: true }
    body:             { type: clob, extra: markdown }
  relations:
    Category:
      foreignAlias:   Products

MyUser2:
  columns:
    name: string(30)
  relations:
    # ...
    Groups:
      class: MyGroup2
      local: user_id
      foreign: group_id
      refClass: UserGroup

MyGroup2:
  tableName: groups
  columns:
    name: string(30)
  relations:
    Users:
      class: MyUser2
      local: group_id
      foreign: user_id
      refClass: UserGroup

UserGroup:
  columns:
    user_id:
      type: integer
      primary: true
    group_id:
      type: integer
      primary: true

Entity:
  columns:
    username: string(20)
    password: string(16)
    created_at: timestamp
    updated_at: timestamp

Child1:
  inheritance:
    extends: Entity
    type: column_aggregation
    keyField: type
    keyValue: 1

Child2:
  inheritance:
    extends: Entity
    type: column_aggregation
    keyField: type
    keyValue: 2

Child3:
  inheritance:
    extends: Entity
    type: column_aggregation
    keyField: type
    keyValue: 3