A discussion about validation and rules for Groups

I am contemplating an Iterator/Generator based solution for group validation:

• http://www.roryoung.co.uk/blog/post/playing-with-project-euler-and-php.html
• http://dikini.net/generator_iterator_protocol_based
• http://c2.com/cgi/wiki?IteratorPattern

Actually, it is quite easy with the API we have for Containers.

$g = $form->addGroup('name')->setLabel('Name:');
$g->addText('first')->setLabel('Firstname');
$g->addText('last')->setLabel('Lastname');

We have $attributes as second parameter for Container constructor, but it look a bit useless for common groups (although it can be useful for custom > elements like hierselects etc). Do we keep it or skip it ?

Default renderer currently substitutes the {attributes} placeholder in group's template. May be useful for e.g. styling the <div> around grouped elements. — Alexey Borzov 2009/10/01 21:41

There is an issue with separator between elements. It's handy to be able to set it in the group itself, but it could also be set in the renderer.