The code from old PHP 4 style constructors methods should be moved to the PHP 5 style constructor ``__construct()``. IMHO it improves readability of the code a lot.

Old constructors need to remain available for at least 1 major version, because otherwise child classes calling the parent's constructor will be broken (for example workflow event types, datatypes, ...). The old constructors can write a warning message that they are deprecated and call ``__construct``.

In a later phase, the old PHP 4 style constructors can be removed.