Category:
  tableName: category
  actAs:
    NestedSet:
      hasManyRoots:   true
      rootColumnName: root_id
    Sluggable:
      unique:    true
      fields:    [name]
      canUpdate: true
      name:      slug
      type:      string
      length:    255
  columns:
    id:
      type:          integer
      primary:       true
      autoincrement: true
    name:
      type:    string(100)
      notnull: true
    summary:
      type:    string(140)
      notnull: false

Collection:
  inheritance:
    type:     column_aggregation
    extends:  Category
    keyField: root_id
    keyValue: 1

Type:
  inheritance:
    type:     column_aggregation
    extends:  Category
    keyField: root_id
    keyValue: 2