We are analyzing CMS's for a new project. One of the requirements is to be able to support multi-tenancy. And not only that, but it must also support allowing a site admin to add new sites that are subordinate to a top-level site. (Think using Umbraco CMS to build a multi-tenant CMS.)

We're finding that Umbraco does support multiple sites, however it does not appear that there is an ability to add child sites to a particular site. It seems that sites follow a flat, non-hierarchical model. And further to that, it appears the user permission assignments are a little difficult to partition correctly so that a site admin would be able to do everything they'd need to do to manage doc types, etc. for their own site without exposing other sites' doc types, etc. also. It seems we'd have to roll our own CMS features.

Anyone have any input?

Much appreciated, thank you.