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There are 10 major assemblies:

Hapi.Base.: assembly contains the core components for parsing/encoding messages. Contains the base classes and interfaces for datatypes, segments, and messages.
NHapi.Model.V21: assembly for HL7 version 2.1. Contains data types, segments, and messages that follow the HL7 2.1 schema.
NHapi.Model.V22: assembly for HL7 version 2.2. Contains data types, segments, and messages that follow the HL7 2.2 schema.
NHapi.Model.V23: assembly for HL7 version 2.3. Contains data types, segments, and messages that follow the HL7 2.3 schema.
NHapi.Model.V231: assembly for HL7 version 2.3.1. Contains data types, segments, and messages that follow the HL7 2.3.1 schema.
NHapi.Model.V24: assembly for HL7 version 2.4. Contains data types, segments, and messages that follow the HL7 2.4 schema.
NHapi.Model.V25: assembly for HL7 version 2.5. Contains data types, segments, and messages that follow the HL7 2.5 schema.
NHapi.Model.V251: assembly for HL7 version 2.51. Contains data types, segments, and messages that follow the HL7 2.51 schema.
NHapi.NUnit: assembly for the unit tests for the base library and v2.x libraries.
NHapi.NUnit.Additional: additional unit test library.

NHapi.Base.dll:
NHapi.Base.Model: provides for all of the base classes for data types, messages, segments, etc
NHapi.Base.Parser: provides for all parsing of HL7 messages in pipe delimited and XML.
NHapi.Base.SourceGeneration: provides for all regeneration of the HL7 2.x schemas.
NHapi.Model.V2X.dll:
NHapi.Model.V2X.Datatype: contains the datatype (i.e. CE, TX, ST) for the HL7 2.X schema
NHapi.Model.V2X.Group: contains the groups for the HL7 2.X schema. Groups are used to represent groupings of message fields (i.e. ADT_A01_Insurance)
NHapi.Model.V2X.Message: contains the messages (i.e ADT_A01, ACK, etc) for the HL7 2.X schema.
NHapi.Model.V2X.Segment: contains the segments (i.e. PID, MSH, etc) for the HL7 2.X schema.