t1 Twinpages t2 :<=> WikiPageName(t1)=WikiPageName(t2) and BiLinked(t1,t2)
Verbose: Two different Wikis are called TwinWikis iff their pages are mapped one-to-one and each mapped pair of pages are namesakes (i.e. share the same WikiPageName).
Due to the name-sharing, TwinPages don't need to repeat the name of their complementary twin ("brother/sister page"). Instead of this, they only need to use their WikiPrefix or WikiLogo? in a uniform way. This is an excellent way to promote wikis by continuous name-recognition.
The metapher "twin" implies symmetry in the sense, that "A is a twin to B" is equivalent to "B is a twin to A".
The terms FriendPage, FriendWikis, PartnerPage?, PartnerWikis? are also worth to be considered to be formalized/implemented/used -- FridemarPache
The FriendPage relation is interesting (as a metaphor and a source of inspiration), because it is
A couple of additional points...
Now we need a decent term for the Wikis who have TwinPages in common. "Sister" A cannot have a T1, wheras "Sister" B has a T2, where T1,T2 are twin pages. Therefore the autor suggests the term TwinWiki. -- FridemarPache
New notation:' After TwinPages we insert the pseudo-icon <=>. If this usage is established, we can omit the pragma "TwinPages", because the pseudo-icon '<=>' appears to be sufficiently selfexplaining, if there are enough use-cases.
Google:TwinPage DiiGo:(1), TrailFire