1 respuesta
<Apex:facet> - primarily used for overriding values such as labels and another common use case is override related list columns when replacing standard pages with visualforce ones.
https://www.salesforce.com/us/developer/docs/pages/Content/pages_compref_facet.htm
<Apex:param> - passing values between page components and controllers
http://bobbuzzard.blogspot.co.uk/2011/07/passing-parameters-to-apex-method-from.html
