tal:define
tal:condition
tal:repeat
tal:omit-tag
tal:replace
tal:content
tal:attributes
tal:on-error
URI for this namespace is http://xml.zope.org/namespaces/tal. To use tal: attribute prefix in XML you're required to declare it:
http://xml.zope.org/namespaces/tal
tal:
<html xmlns:tal="http://xml.zope.org/namespaces/tal" …>
PHPTAL does not enforce this requirement.