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XML messages are structured differently than HL7. Core components of XML include Elements (the tags that contain data), Attributes (properties provided within an element tag), and Namespaces (used to provide uniquely named elements and attributes in an XML document). " Subcomponent Separator " and " Processing ID " are specific to HL7 and are not native structural components of XML.

Profile variables are configuration settings that the interface daemons read when they initialize. If a change is made to a profile variable while the interface is running, the active daemon will not recognize the update. A restart of the Communications and Filer daemons is required to force the system to reload the new configuration from the database.

Bridges uses a hierarchical approach for profile variables. The system first looks at the specific Interface record; if that is null, it looks at the Interface Specification; if that is also null, it falls back to the Interface System Defaults . Since the specific transcription interface has no value, it inherits the ' 8 ' defined at the system level.

HL7 uses specific characters as delimiters to separate data. Based on a standard MSH segment (MSH|^~ & ), the characters & (subcomponent separator) and ~ (repetition separator) are special characters. If these characters appear as part of the actual data text, they must be " escaped " using the escape character (usually \) so the interface parser doesn ' t mistake them for structural separators.

Similar to profile variables, purge settings follow a hierarchy where the more specific configuration overrides the more general one. Because the Interface Specification is more specific than the System Definitions, its value of 45 days takes precedence. Messages for interfaces using that specification will be eligible for purging after 45 days.