Help topic protocol:

article-name ( topic -- string )

article-title ( topic -- string )

article-content ( topic -- content )

article-parent ( topic -- parent/f )

set-article-parent ( parent topic -- )

Boilerplate word help can be automatically generated (for example, slot accessor help):

word-help ( word -- content )

word-help* ( word -- content )

Help article implementation:

lookup-article ( name -- article )

articles

Links:

link

>link ( obj -- obj )

Utilities for traversing markup element trees:

elements ( elt-type element -- seq )

collect-elements ( element seq -- elements )

Links and article instances implement the definition protocol; refer to Definitions.