> For the complete documentation index, see [llms.txt](https://docs.materialsproject.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.materialsproject.org/apps/explorer-apps/mof-explorer/property-definitions/topology.md).

# Topology

What is a MOF topology, and how was it determined?

The MOF topology describes the number of vertices, edges, and connectivity of the MOF building blocks. Several thousand topologies can be explored on the [Reticular Chemistry Structure Resource](http://rcsr.anu.edu.au/nets). In the QMOF Database, the topology is detected using [MOFid](https://doi.org/10.1021/acs.cgd.9b01050) based on the [available topologies](http://rcsr.anu.edu.au/systre) in the RCSR as of June 1st, 2019.