XBNF
hpf-directive-line -to -rule
to to is directive-origin hpf-directive
directive-origin -to -rule
to to is !HPF$
-to or *HPF$
hpf-directive -to -rule
to to is specification-directive
-to or executable-directive
specification-directive -to -rule
to to is processors-directive
-to or align-directive
-to or distribute-directive
-to or dynamic-directive
-to or inherit-directive
-to or template-directive
-to or combined-directive
-to or sequence-directive