Possible embedded elements:

<name>string</name>

This gives the name of the mount.

<compat>string</compat>

Declares that this mount is compatible with another one. Usually this means that either they are directly compatible (e.g. the Pentax KAF2 mount is compatible with Pentax K so you can insert K lenses into a KAF2 camera) or there exists mount adapters which permit to install lenses with such mounts into this mount. Note that the compatibility is unidirectional, e.g. in the above example it doesn't say that you can insert Pentax KAF2 lenses into a Pentax K camera; if you need a two-way compatibility, declare it both ways. Also the "compatibility" is restricted in the sense that if mount A is compatible with mount B (e.g. you can put B lenses on an A camera), and mount B is compatible with mount C, this does not neccessarily mean that mount A is compatible with mount C. Recursion doesn't work here, this is a design decision. If you need to make mount A compatible with mount C, declare it so explicitely.