Is it possible having different link types, like 3, parent, child, friend?

[michaelsjackson]

The different link types could be represented by different colors in emacs buffer, if set somehow in .emacs

The idea has its origin in TheBrain or org-brain, but having a similar feature directly in org-wiki would open up new possibilities. Having at least those 3 new link categories helps in structuring your navigation travels within your notes, so you could always walk into more general direction, just by following parent links, only, and the opposite in child direction, friend links would be kind of like the normal links which org-wiki has now, where its hierarchical location is somewhat free to current concept.