[Zope] regarding tal:on-error

hi, I am thinking of using tal:on-error to catch an exception and traverse to a default pagetemplate. could some one please help me regarding the code .... please clarify if the following statement is valid. <div> tal:on-error="" <p><a href="error" tal:attributes="href python: container.error.absolute_url()"></a></p></div> i believe the above is the wrong form of implementation. I actually need to traverse to "container.error.absolute_url()". please could some one give me the details regarding how to traverse the the following url if the error has occured in a block of code... kindly reply... .