SQL Server supports storing metadata as Extended Properties against database objects such as columns, tables etc

Does anyone know whether it is possible to store Extended Properties against OLAP objects (e.g. cubes, dimensions, measures etc) in the same way?

It would be great to use DSO to extract all the info about OLAP objects and include any user entered descriptions against dimensions, measures etc. Does anyone know of any resources covering this?

BOL doesn't appear to say anything about extended properties on OLAP objects.

I want make documenting my data warehouse as easy as possible and storing object level documentation in the db seems that best way to go.