Text.XML.HXT.XPath.XPathKeywords
a_ancestor_or_self
a_attribute
a_child
a_descendant
a_descendant_or_self
a_following
a_following_sibling
a_namespace
a_parent
a_preceding
a_preceding_sibling
a_self
a_ancestor
n_text
n_processing_instruction
n_node
n_comment