A source code comply to an architectural model when it fully adheres to a set of architectural constraints. A constraint allows to deny references between classes by pattern.

You can for instance use this rule to :

• forbid access to **.web.** from **.dao.** classes
• forbid access to java.util.Vector, java.util.Hashtable and java.util.Enumeration from any classes
• forbid access to java.sql.** from **.ui.** and **.web.** classes