The CDA contains the original Clinical Statement model used in HL7. The clinical statement model as defined in the CDA standard went on to become a standard of its own in HL7, and is now the foundation of other standards in HL7. As a result, understanding the clinical statement model in CDA can help you understand many other HL7 Version 3 standards.
The clinical statement model includes a number of different act classes to choose from. Each class can be connected to other classes in this model through actRelationship associations. There are a set of participations