[XFORMS] Imbrication d'instances et trigger

Bonjour,

J'ai un petit souci sur lequel je sèche depuis maintenant quelques temps.
Le code ci-dessous illustre la situation, mais elle se résume comme suit :

Je souhaiterais que le trigger (contenu dans le div de classe "goal") ajoute à /content/opertional_strategy/goals une nouvelle "entrée" basée sur l'instance "new-goal" et que le champ "indicators" de new-goal soit rempli avec l'instance "new-indicator".

Pouvez-vous m'aider ?
Code:
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xf="http://www.w3.org/2002/xforms" xmlns:ev="http://www.w3.org/2001/xml-events" xmlns:f="http://orbeon.org/oxf/xml/formatting" xmlns:fr="http://orbeon.org/oxf/xml/form-runner" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <head>
        <xf:model>
            <xf:instance id="contents-instance" xmlns="">
        <content>
          <operational_strategy>
            <goals>
              <goal>
                <g>g1</g>
                <indicators>
                  <indicator>
                    <label>l1</label>
                    <baseline>b1</baseline>
                    <target>t1</target>
                    <verification>v1</verification>
                  </indicator>
                  <indicator>
                    <label>l2</label>
                    <baseline>b2</baseline>
                    <target>t2</target>
                    <verification>v2</verification>
                  </indicator>
                </indicators>
              </goal>
            </goals>
          </operational_strategy>
        </content>
        #end
      </xf:instance>
 
      <!-- GOAL instance with initial values -->
      <xf:instance xmlns="" id="new-goal">
        <data>
          <goal>
            <g></g>
            <indicators></indicators>
            <baseline>0</baseline>
            <target>0</target>
            <verification></verification>
          </goal>
        </data>
      </xf:instance>
 
      <!-- Indicator instance with initial values -->
      <xf:instance xmlns="" id="new-indicator">
        <data>
          <indicator>
            <label></label>
            <baseline>0</baseline>
            <target>0</target>
            <verification></verification>
          </indicator>
        </data>
      </xf:instance>
    </xf:model>
  </head>
 
  <body>
    <h1>youpi</h1>
      <xf:group ref="/content/operational_strategy">
        <fieldset class="formOrange">
          <div class="goaltable">
            <div class="header">
              <div class="goal">
                G 
                <xf:trigger appearance="minimal">
                  <xf:label><img src="/css/images/edit.png" alt="Add"/></xf:label>
                    <xf:insert  ev:event="DOMActivate"
                          context="."
                          nodeset="goals/goal[last()]"
                          origin="instance('new-goal')/goal" />
                    <xf:insert  ev:event="DOMActivate"
                          context="."
                          nodeset="goals/goal[last()]/indicators/indicator"
                          origin="instance('new-indicator')/indicator" />
                </xf:trigger>
              </div>
              <div class="indicators">
                  I
              </div>
            <div class="baseline">B/L</div>
            <div class="target">T</div>
        <div class="verification">M</div>
        <div class="tools">T</div>
      </div>
      <div class="clear"></div>
 
      <xf:repeat id="goal-repeat" nodeset="goals/goal">
        <div class="goalObject">
          <div class="g">
            <xf:textarea ref="g">
              <xf:hint>Goal</xf:hint>
            </xf:textarea>
          </div>
 
          <xf:repeat id="indicator-repeat" nodeset="./indicators/indicator">
            <div class="indicatorObject">
              <div class="label">
                <xf:input ref="label">
                </xf:input>
              </div>
              <div class="baseline">
                <xf:input ref="baseline">
                </xf:input>
              </div>
              <div class="target">
                <xf:input ref="target">
                </xf:input>
              </div>
              <div class="verification">
                <xf:input ref="verification">
                </xf:input>
              </div>
              <div class="tools center">
                <xf:trigger appearance="minimal">
                  <xf:label><img src="/css/images/delete.jpg" alt="Delete"/></xf:label>
                  <xf:hint>Delete entry</xf:hint>
                  <xf:action ev:event="DOMActivate">
                    <xf:delete  nodeset="/content/operational_strategy/goals/goal/indicators/indicator" 
                      at="index('indicator-repeat')" />
                     </xf:action>
                </xf:trigger>
                <xf:trigger appearance="minimal">
                  <xf:label><img src="/css/images/edit.png" alt="Add"/></xf:label>
                  <xf:insert  ev:event="DOMActivate"
                        context="."
                        nodeset="/content/operational_strategy/goals/goal/indicators"
                        origin="instance('new-indicator')/indicator" />
                </xf:trigger>
                  </div>
                </div>
              </xf:repeat>
            </div>
            <div class="clear"></div>
          </xf:repeat>
        </div>
      </fieldset>
    </xf:group>     
  </body>
 </html>