> For the complete documentation index, see [llms.txt](https://mims.oascities.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mims.oascities.org/mims-specification-v9.0/citiverse/mim9-citiverse/objective.md).

# Objective

### Objectives

MIM9 enables cities and communities to compose, share, render and serve Virtual Worlds from interchangeable components: 3D content, data, rendering engines, streaming services and collaboration services. Replacing one component should never force a city to rebuild the whole stack. In particular, MIM9 ensures:

* **Composition:** 3D, BIM, geospatial and reality-capture descriptions from different sources can be combined into one world and linked to raw, live and simulated data.
* **Collaboration:** several users and AI agents can share and change the state of the same world, also across platforms.
* **Portable rendering:** the same world can be rendered by different engines and devices with a predictable result.
* **Flexible delivery:** worlds can be served or streamed over different networks and protocols, choosing between client-side, server-side and split rendering by cost, device and network.
* **Inclusion:** worlds remain accessible to people with disabilities and offer non-immersive alternatives.
* **Progressive maturity:** from a single viewable scene to federated, interconnected citiverses that behave as an open marketplace.

MIM9 builds on MIM0 (access), MIM1 (identifiers), MIM2 (representation), MIM3 (exchange and catalogues), MIM6 (security), MIM7 (geospatial) and MIM8 (LDT outputs and visualisation).

**Maturity levels.** Analogous to the LDT categories of MIM8, MIM9 distinguishes four levels of Virtual World. Each level includes the functions of the levels before it.

| Level       | Composed 3D scene | Linked live data | Multi-user collaboration | Federation with other worlds |
| ----------- | ----------------- | ---------------- | ------------------------ | ---------------------------- |
| 1 Viewable  | X                 |                  |                          |                              |
| 2 Live      | X                 | X                |                          |                              |
| 3 Shared    | X                 | X                | X                        |                              |
| 4 Federated | X                 | X                | X                        | X                            |


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