simple interface standard?

Hi, Would there be an objection to specfying a simple standard for interfaces? <<BEGIN STANDARD>> Mypackage.php Mypackage/Interface.php would be a sample structure, so PEAR.php PEAR/Interface.php would contain the PEAR interfaces. Interface names would follow the convention that already exists: interface Mypackage_InterfaceSomething { } or, interface PEAR_InterfaceSomething { } <<END STANDARD>> This way, I could solve all of my concerns about PEAR_Exception with an interface like so: interface PEAR_InterfaceMultiError extends SPL_Iterator {

    public function errorCount();
    public function addError(PEAR_Exception $e);
    public function addWarning(...);
    public function iterator functions that allow foreach/while

} and then users can do this: if ($e instanceof PEAR_InterfaceMultiError) {

    foreach ($e as $error) {
        // do stuff
    }

} and then count on a consistent API, regardless of how it is actually implemented in extended exception classes. Greg