All internal documents on a wiki system

It should be possible to put all internal documents of an organisation on a wiki-system that allows anyone to edit documents, anyone to create documents and, most importantly, allows the recording of meta-information about documents. All documents in the organisation should be linked in together (no orphans).

As some information in an organisation is confidential, sections of the wiki could be locked-off (similar to a file system). Similarly, some documents could be declared as records (e.g. internal policies) to prevent tampering.