Protocol is a synonym of Policy. Resolution is a type of Policy. Resolution is a synonym of Solution. 
Forum is a type of Meeting. Forum is a synonym of Assembly. Legislature is a type of Assembly. Congress is part of Legislature. 
Protocol <--Synonym--> Policy <--IsA-- Resolution <--Synonym--> Solution 
Meeting <--IsA-- Forum <--Synonym--> Assembly <--IsA-- Legislature <--PartOf-- Congress 