API to access MSL.
System.Data.Mapping.StorageMappingItemCollection doesn't provide useful public API.
Object model for mapping is now public in EF 6.1. This will be exposed in several places, including custom Code First conventions.
Alexander Becker commented
I need to get the database schema and column names of a code-first property for example.
This is absolutely the most important feature ever! The EF SQL generation will never be perfect. So why not giving us the ability to write custom SQL queries (if needed) and let EF map the result set to entities and then track them (if required). Something similar to SqlQuery () but just for object graphs.