Database management
Object defines a database table
=> Copy books, header files, subroutines, SQL
E.g. ETK, UDB/DB2, Data dictionaries
Message handling
Object defines a structured message
=> Pack/unpack functions
E.g. XDR (rfc1014, rfc1832)
Flow control
Object defines program logic flow
=> Interpreter for logic flow
E.g. Lex, Yacc, ETK Dialog Designer, Libero
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