MyExceptions::SomeThingy
MyExceptions::SomeThingy::SomeSpecificError
MyExceptions::SomeThingy::AnotherProblem
MyExceptions::SomeThingy::DontDoThat

##</code><code>##

MyException::SomeThingy' => {
        isa         => 'MyException',
        description => 'Bad things happen here.',
        fields      => [ 'descriptor', 'value' ],
};

##</code><code>##

MyException::SomeThingy->throw(
            'error'      => 'You did something I didnt like.',
            'descriptor' => 'DontDoThat',
            'value'   => $bad_variable,
);