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  The catalog pg_namespace stores
  namespaces. A namespace is the structure underlying SQL schemas:
  each namespace can have a separate collection of relations,
  types, etc. without name conflicts.
  
    
    Table 41-21. pg_namespace Columns
    
      
      
      
      
      
        
          | Name | Type | References | Description | 
      
      
        
          | nspname | name |  | Name of the namespace | 
        
          | nspowner | int4 | pg_shadow.usesysid | Owner of the namespace | 
        
          | nspacl | aclitem[] |  | Access privileges; see GRANT and REVOKE for details. |