code: public static Status loadBodyOfRevisionObject(RevisionInternal rev, Document doc) {
          try {
              rev.setSequence(doc.getSelectedSequence());
              doc.selectRevID(rev.getRevID(), true);
              rev.setJSON(doc.getSelectedBody());
              return new Status(Status.OK);
          } catch (ForestException ex) {
              rev.setMissing(true);
              return err2status(ex);
          }
      }
docs: in CBLForestBridge.m
  + (BOOL) loadBodyOfRevisionObject: (CBL_MutableRevision*)rev
  doc: (VersionedDocument&)doc