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DocumentRevision
@GE{Document Revision}: As ArangoDB supports MVCC, documents can exist in more than one revision. The document revision is the MVCC token used to identify a particular revision of a document. It is an integer and unique within the list of document revision for a single document. Earlier revisions of a document have smaller numbers. Document revisions can be used to conditionally update, replace or delete documents in the database. In order to find a particular revision of a document, you need the document handle and the document revision.
ArangoDB currently uses 64bit unsigned integer values for document revisions. As this datatype is not portable to all client languages, clients should rather use strings to store document revision ids locally.