if { ![info exists object_name]}{ set object_name [acs_object_name $object_id]}
if { ![info exists context_id]}{ set context_id $object_id }
set html "<a href=\"${package_url}comment-add?[export_url_vars object_id object_name return_url context_id category]\"$link_attributes>$link_text</a>"
set html "<a href=\"${package_url}comment-add?[export_vars -url {object_id object_name return_url context_id category}]\"$link_attributes>$link_text</a>"