> 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/geospatial-data/mechanisms.md).

# Mechanisms

## Mechanisms

### M1: Legacy Web based Mechanisms

| Requirement                                                                                                                                       | Approach                                                          |
| ------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| R1: Geospatial data shall be exposed through a standards-based web service interface.                                                             | Data is made accessible through OGC WFS                           |
| R2: Geospatial data shall be encoded using open standards. It is recommended to use relevant standards from OGC and Building Smart International. | <p> GML and CityGML should be used for<br>Geospatial encoding</p> |

### M2: API Web based Mechanisms

| Requirement                                                                                                                                       | Approach                                                                                                                                               |
| ------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
| R1: Geospatial data shall be exposed through a standards-based web service interface.                                                             | <p>Data is made accessible through OGC API<br>Features and OGC SensorThings API.</p>                                                                   |
| R2: Geospatial data shall be encoded using open standards. It is recommended to use relevant standards from OGC and Building Smart International. | <p>GeoJSON and CityJSON are preferred<br>for geospatial encoding in API-based<br>mechanisms, with GML, GeoPackage, and<br>CityGML as alternatives.</p> |


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