communicate between components

[sky yjck]

hi,list
  I've some confused question about the communicate between components. Is 
it impossible communicate between components without the page instance?
  For example,I want to design a components structure with parent/children 
relationship :

  <span jwcid="ParentComponent" param1="a" param2="b">
        <span jwcid="ChildComponent" value="a.name"/>
  </span>

  The "a" is an "out" direction  parameter. If I want to use these 
components in a page,I have to define a "a" property in the page :

  <property name="a"/>

  So,suppose my parent/child component is used in other component's 
container :

  <span jwcid="component1">
      <span jwcid="component2">
           <span jwcid="component3">
                   <span jwcid="ParentComponent" param1="a" param2="b">
                        <span jwcid="ChildComponent" value="a.name"/>
                   </span>
           </span>
       </span>
   </span>

   In the page of use "component1",I must define a "a" property 
too,although the "a" property has no any relation with the page.

   Or,suppose I use parent/child component times in a page:

  <span jwcid="ParentComponent" param1="a1" param2="b">
        <span jwcid="ChildComponent" value="a1.name"/>
  </span>
  <span jwcid="ParentComponent" param1="a2" param2="b">
        <span jwcid="ChildComponent" value="a2.name"/>
  </span>
  <span jwcid="ParentComponent" param1="a3" param2="b">
        <span jwcid="ChildComponent" value="a3.name"/>
  </span>

   I must define 'a1','a2','a3' in the page.
   Can we just think about the "a" parameter as a "Local variable" or 
"temporary variable"?Just like when we write the java codes:

   public method(){
        int a = getParameter(); <--- a temporary variable,I don't have to 
define it in the class scope.
        dosomething(a);
   }

   Have anyone feel inconvenience when you design a new compoent with 
these requirement? I don't know if I ignore some important things of 
tapestry.But I've check out the tapestry's build-in Foreach component's 
source.I have to define a temporary property of the page when I use it.The 
Foreach component has a "out" parameter too.

   thx!  :)

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