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 Ontology Layer
  
 
 
 
 
 Ontology Application Services Layer
  
 
 
 
 
 Application Layer
  
 
 
 
 
 User Interface Layer
  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
   
   
   
   
   
   
   
   
   
   
   
   
  
  
  
   
   
  
 
  
  
 
  
  
 
  
  
  
 
  
  
 
  
  
  
 
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
  
 
  
  
 
  
  
 
  
  
 
  
  
 
  
  
 
 
 Semantic
 Representation
 Requirements
  
 
 User 
 (& presentation)
 Requirements
  
 
 Support for User
 to Representation
 Requirements
  
 Search
 Transact
 
 User Roles
 Buyer (Engr., Analyst)
 Seller
  
 Search
 Transact
 Navigate
 Get/Put Data
 Make/Get Alias
 Look-up
 Contextualize
 Infer
 Taxonomies
          Metadata
 Attributes
 In the emerging Web Services paradigm, Levels 1 - 4 consist of
 composable services
 1
 2
 3
 4