[ruote:1717] how to sort the history when save workitem use activerecord

[Neo]

<sequence>
    <case>
      <equals field="need_to_dis" other-value="yes" />
        <sequence>
          <unset field="need_to_dis" />
                        <subprocess ref="http://localhost:6001/defs/
yssq.def" />
                        <subprocess ref="http://localhost:6001/defs/
lzzj.def" />
                        <participant ref="neo" />
                        <concurrence merge="isolate">
                                <subprocess ref="http://localhost:6001/
defs/ggsp.def" />
                                <sequence>
                                        <subprocess ref="http://
localhost:6001/defs/pbys.def" />
                                        <subprocess ref="http://
localhost:6001/defs/ppzj.def" />
                                </sequence>
                        </concurrence>
                        <subprocess ref="http://localhost:6001/defs/
psjg.def" />
        </sequence>
        <sequence>
                        <concurrence merge="isolate">
                                <subprocess ref="http://localhost:6001/
defs/ggsp.def" />
                                <sequence>
                                        <subprocess ref="http://
localhost:6001/defs/pbys.def" />
                                        <subprocess ref="http://
localhost:6001/defs/ppzj.def" />
                                </sequence>
                        </concurrence>
                        <subprocess ref="http://localhost:6001/defs/
psjg.def" />
        </sequence>
          </case>
  </sequence>

some want to look up the history of a subprocess,
but i wrote the subprocess="http://localhost:6001/defs/ggsp.def"; like
this


<process-definition>
  <sequence>
      <set field="is_empty" value="${field:is_empty}"/>
      <case>
            <equals filed="is_empty" other_value="yes"/>
            <subprocess ref="a"/>
            <subprocess ref="b"/>
      </case>

  </sequence>

  <process-definition name="a">
        <participant ref="a"/>
  </process-definition>

  <process-definition name="b"/>
        <participant ref="b"/>
  </process-definition>

</process-definition>

so i want to look the history of one subprocess has property "ref",is
ruote can do this job?
there is only a wfid in database!

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