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1. If the existing explicitly defined data type or data type already exists, an error is returned
2. If a parent of the data type does not exist, it is created
3. if a parent of the data type exists
   1. If the parent definition is the same as whats in the database, then its OK
   2. If the parent definition is different on the incoming specification, then an error is reported
4. For child data types specified on the incoming data type definition
   1. If the data type definition does not exist, it is created
   2. If the data type definition exists
      1. If the data type definition is the same as whats in the database, then its OK
      2. If the incoming data type definition is different to whats in the database, then an error is reported
   3. If a referenced child definition does not exist in the database, then an error is reported