A single VMD file can be used to handle (parse, generate, or transform) any number of different message types; each with potentially different mapping logic. The Create Message Wizard allows you to automatically create a message definition and its associated identity.

To use the Wizard:

• Return to the Browser, and click the yellow panel. In the Create Message Wizard, you will notice that both the Name and Description fields have been automatically filled in by Chameleon (as shown below).

Let's examine how Chameleon recognizes and identifies messages. Typically, HL7 messages are identified using the first two subfields of the Message Type field. In the sample HL7 message, you can identify the Message Type subfields by expanding the tree view of the message in the Browser. In the tree view shown below, you will see that the Message Code is "ADT" and that the Trigger Event is "A04". Chameleon will automatically identify this as a PatientRegister message and fill in the appropriate values in the Identity window.

• Click Finish to define the message and its identity using the default values.

Four events occur:

• The message is re-parsed automatically and is now recognized by Chameleon:

• A Message Definition is added to the Workspace:

• The Identity window is automatically filled in with Segment, Field and Value data:

• MSH is added to the segment grammar:

The next step is to add segments to the segment grammar.

	To learn more about the Create Message Wizard, see Using the Create Message Definition Wizard. To learn more about message identities, see Using Message Identities and Message Identities.