The example of what I want to do :

Parent HTML:

<wicket:child>    
 .....
 <span wicket:id="xxx"></span>  
</wicket:child>`   
...  

Child HTML:

<wicket:extend>
... child content ...
</wicket:extend>

Supposedly when child page is opened the extend tag will replace all the content between the child tag in parent html, including the <span wicket:id>.

Apparently this won't work, when the child page is open error will occur:
Wicket tags identified by wicket:id are not allowed in between wicket:child> and </wicket:child>

I assume this is because the wicket:span tag got pass into the child extend page and cause this issue? If the span is removed the problem is resolved.

Is there anyway I can keep the span tag in paranet HTML and still make this work?