MetaX (Meta Tags Extended) is an Extra for MODX Evolution and Revolution. It is an automated & simple snippet designed to generate the HTML base, meta and a couple links tags to make sure that your site has all the elements it needs.
The current documentation is here http://rtfm.modx.com/display/ADDON/MetaX and I will make sure it is kept up to date.
If you need help feel free to post on the MODx forums, I am around to help if any is needed. This snippet is rigorously tested before each release to ensure its reliability. Kudos to AMDBuilder, http://www.amdbuilder.net/ for help with the testing.
Supports MODX Revolution 2.0 and later. You can download MetaX in the package manager or on the MODX website at http://modx.com/extras/package/metax.
Support MODX Evolution 0.9.6 and later. You can download MetaX for Evolution at http://modx.com/extras/package/metax-evo