Another token enhancement proposal

Token should probably provide an easy way for modules to create tokens based on already existing tokens. Let me explain what I mean. For a node, I should be able to pass in 'author-' as a prefix, 'user' as the type, and the node's author as the object. Token would then get all the values for 'user' with the object $user, and would return them as the tokens [author-usertokenpropertyhere]. This could be used by many modules: nodes could create tokens for their organic groups as [og-nodeproperty], buddylist could create tokens for the user's buddies as [buddylist-userproperty], and nodes could create tokens for their terms as [tax-taxonomyproperty].

Token would have to check to make sure that we are not caught in an infinite loop (node calls its organic group, which calls its organic group, which calls its organic group, etc., or node calls its author, which calls its most recent post, which calls its author, etc). In some case recursiveness could be useful (node calls organic group which calls author), but it would have to make sure that the same property isn't being called twice.

Admittedly, this would cause performance declines- however, if it becomes possible to disable certain tokens that are not used, it would stop being a performance problem and start being an optional feature that would increase the power of token and the modules that use it.

This would be a highly useful feature, and many modules would be able to take advantage of this. There are countless ways where nodes, users, taxonomy items, comments, etc. interact, and this property would allow the token module to make use of these interactions.