Level 4 |
Sub-fields may be nested at one additional level, here named sub-sub-fields. Fourth level delimitation distinguishes between sub-sub-fields in sub-fields. The delimiter can be either permanently defined in the character column of the table above or can be taken from message header (position 7 for HL7). HL7 specifies the usage of '& at this level, but not many implementations really adhere to this recommendation.
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Some illegal implementations of HL7 do not recognize the & character and can in fact have it embedded with user data. In those implementations, to allow Chameleon to parse them correctly, you can delete the level 4 delimiter so that these characters are parsed normally. Another trick to remember is that you can also switch off the HL7 escaping behavior for this or other HL7 delimiter characters by changing the 'escaped' column to n.a. | ||
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