entity block

An entity is a document-root block. It can contain one owner statement, one lifecycle, and any number of field and relationship blocks. An empty entity is valid.

entity Order
  field Order number
    type text
  end
end

entity Orderline
  owner "Order"
end

owner names the entity that owns this entity — the aggregate root this entity's lifecycle is bound to. It is optional: an entity with no owner statement is its own aggregate root. Give it the name of another entity in the workspace, in quotation marks:

owner "Order"

owner cannot name the entity itself, and cannot form a cycle — for example, Order cannot declare owner "Orderline" while Orderline declares owner "Order". Naming an entity that isn't declared anywhere is also an error.