XML/Browser friendly PHP templating system?

I’d like to migrate some designers over to a templating system that works with PHP. Currently Smarty is the PHP templating of choice, however it isn’t XML and isn’t friendly to browser preview sans PHP running (i.e. inside Dreamweaver and/or locally on a system without Apache running).

In the Python and Ruby world there are numerous templating languages that fit this bill, e.g.Kid and ZPT. I can’t seem to find anything for PHP like this, and I swore there were several. Anyone have any suggestions?

The only good PHP template systems I have found are either Smarty or ones built-in to full-fledged CMSes. I’ve ended up writing one or two of my own for custom use just because I haven’t found anything out there.