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Home Architecture, security and coding HL7 escape characters and nHapi
HL7 escape characters and nHapi
Written by Division by Zero   
Friday, 28 May 2010 07:46

After some testing I found out that nHapi does not convert all escape characters provided by the HL7 standard. So here's a list of escape characters and the way nHapi handles them. As you'll probably know the characters to signify an escape character is defined in the header of a Hl7 message along with the field separator, the repetition separator, the component separator and the subcomponent separator. For example the following header is the default:

MSH|^~\&|ADT1 (here '^' is defined as component separator and '\' is defined as escape character)

The following table uses the default escape characters (as defined in the example above).

Escape sequence Description
\E\ Escape character is converted (‘\’)
\F\ Field separator is converted (‘|’)
\R\ Repetition separator is converted (‘~’)
\S\ Component separator is converted (‘^’)
\T\ Subcomponent separator is converted (‘&’)
\H\ Start highlighting is not converted
\N\ Normal text (end highlighting) is not converted
\Cxxxx\ Single-byte character is not converted
\Mxxyyzz\ Multi-byte character set escape sequence not converted
\Zxxxx\ Locally defined escape sequence not converted
\Xxxxx\ Hexadecimal data should be converted to the characters identified by each pair of digits (see remarks below)

A special note on the last one: The hexadecimal data is supported by nHapi. That is, it is partly supported. To narrow it down further: I only got one hexadecimal sequence working. This sequence is \X000d\ (carriage return, ASCII 13). To test the hexadecimal conversion I wrote a loop with all possible hexadecimal values and only the carriage return was converted.

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