The EVA Netmodeler Filter Model
                What a user sees is affected by: 
                
                    - Security Permissions (what are you possibly allowed?)
 
                    - Domain Filters (what sets of types do you want to see?)
 
                    - Item Filters (what items within allowed types do you want to see?)
 
                    
                        - Attribute filters
 
                        - Relationship filters
 
                        - Hierarchy filters
 
                     
                 
                General characteristics of filters.  
                
                    - Filters are activated within a session and remain active until altered.
 
                    - Users can activate additional filters or deactivate filters at any time during a session 
 
                    - Filters affect the visible data across all browsers while active
 
                    - Filters are named and stored for easy use by non-technical users
 
                    - They can be combined logically (e.g. AND, OR)
 
                    - Users can specify which filters to activate at login time
 
                 
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