assert( reg.getPrefix( objectName ) == prefix );
assert( reg.getObjectName( prefix ) == objectName );
assert( reg.getLegalAttributes( objectName ).equals( attrs ) );
reg.removeMapping( objectName );
assert( reg.getPrefix( objectName) == null );
assert( reg.getObjectName( prefixes[ i ] ) == null );
assert( reg.getLegalAttributes( objectName ) == null );
}