> For the complete documentation index, see [llms.txt](https://guides.ohie.org/arch-spec/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.ohie.org/arch-spec/2.0/undefined.md).

# OpenHIE Architecture Specification Version 2.0

Version 2.0 (September 2019) of this specification was published as a PDF. This version of the document may be downloaded from the OpenHIE website.

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