HL7DataSegmentDef Class

What is a "No Nulls" Class? It means that we have gone to great lengths so that there no exceptions thrown or null values returned on accessor methods. You really have to try and break it (please don't though).

But how does it work in practice? It means that if you would like to see what is in Field 1500 of your segment (hint, there is no field 1500) you can call Field(1500) and we will return a real HL7DataFieldDef class object. It will undefined (IsDefined == False) we will return "Undefined" for most of the String properties but we won't throw an exception or return a null value.

Boolean IsDefined. Will be False if the Segment object is not part of the Vendor Definition