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Setting Up the Table Grammar |
In Chameleon, a table is a data structure that holds data to be mapped into an HL7 message. For a given message, you can map data from one or more tables. The set of such tables is called the table grammar of the message.
In this section of the tutorial, you will define a simple table grammar for the LabResult message type you have defined.
Defining the table grammar involves two main steps:
- First, you must define the table or tables from which you will map data. Your choices here should reflect how data is managed in your application and the way the message is to be structured. The tables will become actual data structures in your application code.
- Second, you must define the mappings from the tables to the HL7 message.
When designing and defining tables, the best approach is to define one table for each segment of the HL7 message to be generated. For the sample message in this tutorial, you need to define four tables, as shown below:
| Table Name | Table Contents | Mapping Details |
|---|---|---|
| MessageInfo | Data to be mapped to the MSH (Message Header) segment | One row of this table is mapped for each new message. |
| Patient | Data to be mapped to the PID (Patient Identification) segment | One row of this table is mapped for each new message. |
| ObservationRequest | Data to be mapped to the OBR (Observation Request) segment | One row of this table is mapped for each new message. |
| ObservationResult | Data to be mapped to the OBX (Observation Result) segment | One row of this table is mapped for each new OBX segment in each message. |