This package contains SchemaObject's for ddl generation including Table, Field, 
        KeyGenerator, Index, Schema,ForeignKey and PrimaryKey. SchemaObject's support
        generation of 'standard' DDL for various databases. Specific databases must
        overwrite some SchemaObject's if the target DDL is different from the 'standard'.
        
            - Author: 
- Le Duc Bao
- Author: 
- Ralf Joachim