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The template is built of a series of sub-templates
A sub template is responsible for creating each of the main message segments (MSH, PID, PV1, ORC, OBR and OBX)
Each sub template may be in turn composed of several other sub templates.
The MSH segment is made up of all constants, and hence may not need to be composed of other segments.
The OBR segment is used to represent an OpenMRS obs group

Converting the xml version of the hl7 message into the pipe delimited format.

1. Convert the xml object into string
2. Convert the string into the HAPI object
3. Use HAPI to convert the hl7 message into the pipe delimited format

Converting an hl7 String into the HAPI object

public Message processMessage(String hl7, String enterpriseId) throws HL7Exception {

		log.debug("Register handler applications for R01 and A28");
		// TODO draw registered applications from database or configuration file
		router = new MessageTypeRouter();
		router.registerApplication("ORU", "R01", new RHEA_ORU_R01Handler(enterpriseId));

		// First, try and parse the message
		Message message;
		try {
			message = parser.parse(hl7);
		}
		catch (EncodingNotSupportedException e) {
			throw new HL7Exception("HL7 encoding not supported", e);
		}
		catch (HL7Exception e) {
			throw new HL7Exception("Error parsing message", e);
		}

		return response;
	}
}

Converting the HAPI object into the pipe delimited format is done using a HAPI PipeParser

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