# M4M Architecture

M4M is a runtime framework to provide XR presentation of digital twins for any identities. Those digital twins interactive with multiple XR systems or metaverses, thus the presentation can be shared accordingly.

![M4M reference architecture](/files/Pz8hzV2m6vgAs5EXk1Ax)

The architecture of M4M includes four layers,

1. [**Protocol layer**](/n3aRZyTVBZbh3tNUbNSq/technical-specification/protocol-layer.md). Provides a series of standard or protocols for presentation tracing and statistics, static modeling and storage, and dynamic presenting.
2. [**Meta layer**](/n3aRZyTVBZbh3tNUbNSq/technical-specification/meta-layer.md). Resource management for meta of static modeling and dynamic presentation.
3. [**Present layer**](/n3aRZyTVBZbh3tNUbNSq/technical-specification/present-layer.md). Runtime network for digital twin presenting cross XR systems or metaverses.
4. [**Application layer**](/n3aRZyTVBZbh3tNUbNSq/technical-specification/application-layer.md). Applications for self-sovereign twin presentation management. Provides capability for common sharing or presentation interoperability.


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