h：在ui中的dataTable：重复，如何从f：ajax指定渲染ID？

I have:

<ui:repeat id="projectsTable" var="project" value="#{projectsBacking.projectList}">
  #{project.id}
  <h:dataTable id="usersAssignedToProject#{project.id}" var="appUser" value="#{projectsBacking.getAllUsersAssignedToProject(project)}">
    #{project.id}
    <h:column>
      <h:outputText value="#{appUser.getUsername()}"/>
    </h:column>
  </h:dataTable>
</ui:repeat>
<ui:repeat id="projectsTable" var="pr