Hi, 

here is now my schema :

  <xs:complexType name="stringItem">
        <xs:sequence>
                <xs:element name="stringItem" type="xs:string" default="?" />
        </xs:sequence>

  </xs:complexType>
  <xs:complexType name="categoryList">
        <xs:sequence>
                <xs:element name="stringItem" type="nds:stringItem"
                        minOccurs="0" maxOccurs="unbounded" />
        </xs:sequence>
  </xs:complexType>
<xs:element name="categories" type="nds:categoryList" />


here is my widget :
      <widget name="categories" type="list">
        <labels>
          <label mode="any">categories</label>
        </labels>
        <translated>false</translated>
        <fields>
          <field>notedeservice:categories</field>
        </fields>
                <subWidgets>
              <widget name="category" type="text">
                <fields>
                  <field>notedeservice:stringItem</field>
                </fields>
              </widget>
                </subWidgets>
      </widget>


I am getting an exception :
2008-04-02 17:11:10,484 ERROR [STDERR] 02-avr.-2008 17:11:10 
com.sun.faces.lifecycle.ApplyRequestValuesPhase execute

ATTENTION: /widgets/list_widget_template.xhtml @68,82 
actionListener="#{editableListBean.performAction}": javax.faces.FacesException: 
javax.el.ELException: /widgets/list_widget_template.xhtml @33,41 
template="#{nxd:defaultValue(widget.fieldDefinitions[0].schemaName, 
widget.fieldDefinitions[0].fieldName)}": Problems calling function 
'nxd:defaultValue'

javax.faces.el.EvaluationException: /widgets/list_widget_template.xhtml @68,82 
actionListener="#{editableListBean.performAction}": javax.faces.FacesException: 
javax.el.ELException: /widgets/list_widget_template.xhtml @33,41 
template="#{nxd:defaultValue(widget.fieldDefinitions[0].schemaName, 
widget.fieldDefinitions[0].fieldName)}": Problems calling function 
'nxd:defaultValue'

        at 
com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)

        at javax.faces.component.UICommand.broadcast(UICommand.java:376)

        at 
org.ajax4jsf.framework.ajax.AjaxActionComponent.broadcast(AjaxActionComponent.java:47)

        at 
org.ajax4jsf.framework.ajax.AjaxViewRoot.processEvents(AjaxViewRoot.java:180)

        at 
org.ajax4jsf.framework.ajax.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:158)

        at 
org.ajax4jsf.framework.ajax.JsfOneOneInvoker.invokeOnRegionOrRoot(JsfOneOneInvoker.java:62)

        at 
org.ajax4jsf.framework.ajax.AjaxContext.invokeOnRegionOrRoot(AjaxContext.java:176)

        at 
org.ajax4jsf.framework.ajax.AjaxViewRoot.processDecodes(AjaxViewRoot.java:267)

        at 
com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:101)

        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)

        at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)

        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:100)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:32)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:209)

        at 
org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:166)

        at 
org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:139)

        at 
org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)

        at 
org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:115)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.nuxeo.ecm.platform.ui.web.auth.NuxeoAuthenticationFilter.doFilter(NuxeoAuthenticationFilter.java:417)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.nuxeo.ecm.platform.ui.web.shield.NuxeoExceptionFilter.doFilter(NuxeoExceptionFilter.java:104)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.jboss.seam.servlet.SeamExceptionFilter.doFilter(SeamExceptionFilter.java:46)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)

        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)

        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)

        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)

        at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)

        at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)

        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)

        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)

        at 
org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)

        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)

        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)

        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)

        at 
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)

        at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

        at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)

        at java.lang.Thread.run(Thread.java:595)

Caused by: javax.faces.FacesException: javax.el.ELException: 
/widgets/list_widget_template.xhtml @33,41 
template="#{nxd:defaultValue(widget.fieldDefinitions[0].schemaName, 
widget.fieldDefinitions[0].fieldName)}": Problems calling function 
'nxd:defaultValue'

        at 
org.nuxeo.ecm.platform.ui.web.component.list.UIEditableList.getTemplate(UIEditableList.java:594)

        at 
org.nuxeo.ecm.platform.ui.web.component.list.EditableListBean.performAction(EditableListBean.java:143)

        at 
org.nuxeo.ecm.platform.ui.web.component.list.EditableListBean.performAction(EditableListBean.java:99)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

        at java.lang.reflect.Method.invoke(Method.java:585)

        at com.sun.el.parser.AstValue.invoke(AstValue.java:151)

        at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)

        at 
org.jboss.seam.ui.facelet.OptionalParameterMethodExpression.invoke(OptionalParameterMethodExpression.java:34)

        at 
com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)

        at 
com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69)

        ... 61 more

Caused by: javax.el.ELException: /widgets/list_widget_template.xhtml @33,41 
template="#{nxd:defaultValue(widget.fieldDefinitions[0].schemaName, 
widget.fieldDefinitions[0].fieldName)}": Problems calling function 
'nxd:defaultValue'

        at 
com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)

        at org.nuxeo.ecm.platform.ui.web.component.list.UIEdita

2008-04-02 17:11:10,484 ERROR [STDERR] 
bleList.getTemplate(UIEditableList.java:592)

        ... 72 more

Caused by: java.lang.NullPointerException

        at 
org.nuxeo.ecm.platform.ui.web.tag.fn.DocumentModelFunctions.defaultValue(DocumentModelFunctions.java:325)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

        at java.lang.reflect.Method.invoke(Method.java:585)

        at com.sun.el.parser.AstFunction.getValue(AstFunction.java:114)

        at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:192)

        at 
com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)

        ... 73 more
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