anchor.diff:      | VAR
       | VARP
       | VIEW_METADATA
  +    | VIEWS
       | WORK
       | XML
       | XMLNAMESPACES
  
positive.code:     | DISABLE
      | DYNAMIC
      | ENCRYPTION
      | FAST
      | FAST_FORWARD
      | FIRST
      | FOLLOWING
      | FORWARD_ONLY
      | FULLSCAN
      | GLOBAL
  
negative.code:     : func_proc_name
      | RIGHT
      | LEFT
      | BINARY_CHECKSUM
      | CHECKSUM
      ;
  
  // https://msdn.microsoft.com/en-us/library/ms187752.aspx
  