Hi all, as we started to define the strawman in a OO way, we decided to use only simple OO features, and in particular no polumorphosm and multiple inheritance. The strawman right now respects that. However, as we now ponder over additional interfaces, such as permissions, we get into trouble: the file class would for example implement both the attribute and the permission interface, and hence would be inheriting multiple bases. In terms of implementation this can be avoided I think, although not beautifully. Hence the question, if that limitation is neccessary/wanted/needed on specification level. Plymorphism on the other hand can _not_ easily be avoided on implementation level once it is written down in the spec, and hence should not enter it. So, my opinion is to allow multiple interfaces on classes in the spec, bat take care that an implementation can be done w/o the need for multiple inheritance. Any other opinions? :-) If not, I would adjust the respective part in the intro. Cheers, Andre. -- +-----------------------------------------------------------------+ | Andre Merzky | phon: +31 - 20 - 598 - 7759 | | Vrije Universiteit Amsterdam (VU) | fax : +31 - 20 - 598 - 7653 | | Dept. of Computer Science | mail: merzky@cs.vu.nl | | De Boelelaan 1083a | www: http://www.merzky.net | | 1081 HV Amsterdam, Netherlands | | +-----------------------------------------------------------------+