current = rests[0].object

    return out

  contains: (s, p, o) ->

    @_autoDeps.askedFor(s, p, o, null)

    return @graph.getQuads(s, p, o).length > 0

  nextNumberedResources: (base, howMany) ->

    # base is NamedNode or string

    # Note this is unsafe before we're synced with the graph. It'll

    # always return 'name0'.

      start = 0

    for serial in [start..1000]

      uri = @Uri("#{base}#{serial}")

      if not @contains(uri, null, null)

        results.push(uri)

        @_nextNumber.set(base, serial + 1)

        if results.length >= howMany

          return results

    throw new Error("can't make sequential uri with base #{base}")

  nextNumberedResource: (base) ->

    @graph.applyAndSendPatch(patch)

    return effect

  syncFromGraph: ->

    U = (x) => @graph.Uri(x)

    return if not @effect

    toClear = new Set(@activeSettings.allSettingsStr())

    for setting in @graph.objects(@effect, U(':setting'))

      dev = @graph.uriValue(setting, U(':device'))

      devAttr = @graph.uriValue(setting, U(':deviceAttr'))