The links to the official standards for sending outpatient letters and discharge summaries to GP’s (Transfer of Care in the diagram above):
Technical links: This is to eDischarge which I believe is most mature at the moment Introduction to ITK3 eDischarge | ITK3 eDischarge
GP Connect is working on Send Task which would allow PDF’s/HTML documents to be sent to the GP system. This is a link to EMIS webpage Extra | GP Connect Viewer | EMIS
The tech spec should appear here https://nhsconnect.github.io/gpconnect/tasks.html (it’s just a place holder at present)
All of these use MESH (formerly known as DTS) to send documents to GP systems. Paul mentions another method which uses Kettering XML to send html documents to GP’s. This is a link to Visions notes on Kettering XML http://www.inps.co.uk/sites/default/files/Kettering%20Format%20Messages%20in%20Vision.pdf
They mostly use the same metadata. An example of metadata is represented below, this is from an app which is used to put documents (html/pdf/FHIR documents) into the Care Connect Reference Implementation using the FHIR based CareConnectAPI:
This patient has two FHIR Documents (so not pdf/html) but the metadata is the same.
This is a link to the raw data in the reference implementation CCRI - Document Search on patient 1170
The metadata it uses is based on the one used in the National Record Locator Service (NRLS) Tech link: Introduction to the National Record Locator | FHIR-NRLS-API