HL7 Message validation is a complex flat-file structure that, despite being considered a data standard, is also highly flexible. It is often expected of an HL7 integration engine that non-standard compliant data be accepted and processed without notification to the receiving system of non-compliance.
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However, to achieve real interoperability, the HL7 standard should be constrained to reduce the degree of freedom e.g. how to use certain fields or whether to populate optional fields or not. This happens either based on a written specification or in addition as machine-readble conformance profile. In order to check whether HL7 messages actually conform to the defined constraints, message validation is essential.
There are two ways to validate: