Wikis are increasingly being used in world-wide, intranet and
even in personal settings. Unfortunately, current wikis are data islands:
people can read and edit them, but machines can only send around text
strings without structure. Wiki migration, publishing from one wiki
another one and free choice of syntax hold back broader wiki usage.
We define a wiki interchange format (WIF) that allows data exchange
wikis and between related tools. Different from other approaches,
we also tackle page content and semantic annotations. The linking
formal annotations to parts of a structured text is analysed and described.