To define a Max-Page or -Profile of an object.

contact:max
Description
Link to the Max page for a feature. Edit this description in the wiki page. Edit this description in the data item.
Group: annotations
Used on these elements
may be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)may be used on relations
See also
Status: in use

The value is the Page-/Profil-URL or the Pagename.