From: Eivind Eklund Date: 2007-12-14T19:16:16+09:00 Subject: Re: declaration for module methods which need to be implemented On Dec 13, 2007 11:30 PM, Paul wrote: > Let's say I have the following module: [...] > Is there a way to enforce that the 'children' method is understood in > any class which includes this module? Or do I simply rely on a > comment, as above There are ways (you can play around with Parenting.inherited and do method rewrites), yet I suspect you're better off with a comment. All methods for ensuring this have limitations that will block some cases of valid code (though that may be resolved by adding a sort of say-that-it-is-OK method). Eivind.