Is there any document for runtime implementation?

As I know the OpenXR spec is for application developers.
Is there any document which guides us to implement a runtime?
For example, I want to develop a runtime for Android system, where can I get started?


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Actually the spec is primarily for runtime authors, since runtimes are what we can conformance-test. Most “normative language” (bold, purple words in the rendered output like “must”, “should”, “may”) in the spec is intended to specify the behavior of the runtime.

I work for Collabora, who leads the Monado open-source OpenXR runtime project, which does work on Android - perhaps you might want to get in touch with us or the project to build on our existing platform.