question: @ Override public XSSimpleType createTypeUnion ( String name , String targetNamespace , short finalSet , XSSimpleType [ ] memberTypes , XSObjectList annotations ) { int typeNum = memberTypes . length ; XSSimpleTypeDecl [ ] mtypes = new XSSimpleTypeDecl [ typeNum ] ; System . arraycopy ( memberTypes , 0 , mtypes , 0 , typeNum ) ; if ( fDeclPool != null ) { XSSimpleTypeDecl st = fDeclPool . getSimpleTypeDecl ( ) ; return st . setUnionValues ( name , targetNamespace , finalSet , mtypes , annotations ) ; } return new XSSimpleTypeDecl ( name , targetNamespace , finalSet , mtypes , annotations ) ; }
target:  Create a new simple type which is derived by union from a list of other simple types.