http://purl.org/tm/schemas/amod/ This is the schema that provides a core assertion model. The assertion model is a bit simpler than the one informatively defined by the Topic Maps Reference Model, as it does not provide reifications of castings, but instead uses tuples of (role,player) to express the relationship between each player and the role it plays. A single property definition is sufficient to express the 'semantics' of a complete assertion and this schema currently only provides this definition. Other properties can be defined later, especially those that express the collection of role playings of each player (collection of (role,assertion) tuples). These will be OPs whose values are conferred by the respective a-sidps. a-sidp This property expresses the subject of a topic that represents a complete assertion (the type and all (role,player) tuples. The structure of the value type is (T, ((r1,x1),(r2,x2),...,(rn,xn)) ) ASIDP yes