#foreach ($key in ${pbean.categoriesOfInterest}) #end
Personalization:
Category $webapi.getCategoryByInode("$key").categoryName

#foreach ($key in ${request.attributeNames}) #end
request:
$key ${request.getAttribute("$key")}

#foreach ($key in ${session.attributeNames}) #end
session:
$key ${session.getAttribute("$key")}

#foreach ($key in ${request.cookies}) #end
Cookie:
$key.name $key.value $key.maxAge