is_valid
Description:
This method tells if all this's Holder objects are valid, and if they represent a valid combination of values, as defined by rules external to Libgda: the "validate-set" signal is emitted and if none of the signal handlers return an error, then the returned value is TRUE, otherwise the return value is FALSE as soon as a signal handler returns an error.
Parameters:
| this |
a Set object |
Returns:
|
TRUE if the set is valid |