Can anyone add some infomation about building protected sites inspire layer? I cannot understand the whole specification schema and I didn't know how to use it in a real database.
Probably you are better off at a special INSPIRE interest group specific to either your country or your area of interest.
The problem with the INSPIRE models is that they define a UML schema, which has multiple mappings to relational databases. So there is not the way to use the schema in a database, but you'll have to derive the actual database tables on your own (please correct me where i am wrong).