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OpenAPI Extensions
For some functionality that is not directly provided by the OpenAPI v3.1 specification, some extensions have been added that are to be consistent across the specification. The defined extensions are listed below. Extensions should not break parsers, however if extra functionality is required, aware parsers should be able to take advantage of the added syntax.
Using multiple files to describe API
To ease API design and management, the API definition is split across several files. Each of these files is self-contained valid OpenAPI.
There is no single root file in the source tree as OpenAPI requires; this file
can be generated by dump-openapi.py. The script does not convert
the extensions described further in this document so there can be minor
interoperability issues with tooling that expects compliant OpenAPI.
Custom x-addedInMatrixVersion key
This property is added throughout the OpenAPI schemas to denote which version of the Matrix specification added the associated object (endpoint, parameter, property, etc).
Custom x-changedInMatrixVersion key
A variation of the above: indicates changes to the associated parameter in particular Matrix specification versions.