FHIR-based Document Search Enhanced: Support for Multiple Document Types

Details

According to the commit logs, the 'Find Document References' feature was updated to accept an optional parameter, 'type'. This enables the system to identify and search across multiple document types—not just IPS, but also MeOW and IT. Technically, a map of document types is extracted from `constants/documentTypes.js` for sharing among related modules. Furthermore, the controller was generalized to accept LOINC (Local Use Item and Number System) as the document type instead of hardcoding dependence on IPS. This generalization facilitated support for other document types like MeOW and IT. New endpoints and routing configurations were added, such as `/fhir/MeOWTransaction` and `/fhir/ITDocument`, to handle these diverse documents. These changes significantly improve flexibility and extensibility in healthcare information exchange based on FHIR standards. The ability to manage multiple distinct document types through a single search interface is particularly valuable for Japan's complex EHR environment and varied data linkage needs, enhancing interoperability across different clinical workflows.