docs: def getShare(self, shareID):
          """
          Retrieve a proxy object for a given shareID, previously shared with
          this role or one of its group roles via L{Role.shareItem}.
  
          @return: a L{SharedProxy}.  This is a wrapper around the shared item
          which only exposes those interfaces explicitly allowed for the given
          role.
  
          @raise: L{NoSuchShare} if there is no item shared to the given role for
          the given shareID.
          """
          shares = list(
              self.store.query(Share,
                               AND(Share.shareID == shareID,
                                   Share.sharedTo.oneOf(self.allRoles()))))
          interfaces = []
          for share in shares:
              interfaces += share.sharedInterfaces
          if shares:
              return SharedProxy(shares[0].sharedItem,
                                 interfaces,
                                 shareID)
          raise NoSuchShare()