i would think that with the cmf bundles, it should not create confusion if we just use cmf instead of symfony-cmf in the prefix. i think at least for larger doc examples, the root element with doctype is nice, but i think the user should survive if short snippets just have the prefix and use cmf-X there. if we make everybody use that prefix as default instead of symfony-cmf-X and are consistent about it, it should not be painful.