Icarus Class: RDBMetaphor
Represents the mapping information required to write the contents of an OM object to a RDBS.
className Attribute may stay unnamed in attribute list.Attribute value must be specified.
  The name of the class which this mapping information has been written for.
schema  
  Default schema name for this metaphor.
table  
  Default table name for this metaphor.
constraint  
  Constraints for this table.
attrMetaphors Attribute is multivalued (list). AttrRDBMetaphor  
  The mapping information to write the contents of the object attributes.