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                        The XWAYLAND Extension
			    Version 1.0
			     2022-07-29

1. Introduction

The XWAYLAND extension allows clients to reliably identify whether an X server
is Xwayland. It does not provide any functionality beyond the absolute minimum
to identify as extension.

Only Xwayland initializes this extension. Thus, if the extension is present,
the X server is Xwayland. Clients should not need the protocol detailed in this
document, a QueryExtension or ListExtensions request is sufficient to check
whether the extension is present.

The protocol detailed in this document is merely to future-proof this extension
in case actual functionality is added in the future.

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2. Version History

- 1.0, July 2022: QueryVersion request only

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3. Events and Errors

XWAYLAND defines no events or errrors

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4. Extension initialization

The name of this extension is "XWAYLAND"

┌───
   XwlQueryVersion
	client-major-version:	CARD16
	client-minor-version:	CARD16
      ▶
	major-version:		CARD16
	minor-version:		CARD16
└───

	The client sends the highest supported version to the server
	and the server replies with the highest version it supports,
	but no higher than the requested version. Major versions changes
	can introduce incompatibilities in existing functionality, minor
	version changes introduce only backward compatible changes.
	It is the clients responsibility to ensure that the server
	supports a version which is compatible with its expectations.

	Backwards compatible changes include addition of new
	requests.

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Appendix A. Protocol Encoding

Syntactic Conventions

This document uses the same syntactic conventions as the core X
protocol encoding document.

A.1 Common Types

None.

A.2 Protocol Requests

┌───
    XwlQueryVersion
	1	CARD8			major opcode
	1	0			XWAYLAND opcode
	2	2			length
	2	CARD16			major version
	2	CARD16			minor version
      ▶
	1	1			Reply
	1				unused
	2	CARD16			sequence number
	4	0			reply length
	2	CARD16			major version
	2	CARD16			minor version
	20				unused
└───

A.3 Protocol Events

The XWAYLAND extension defines no events.

A.4 Protocol Errors

The XWAYLAND extension defines no errors.

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