Raised by Dan Scott @dbs  in http://lists.w3.org/Archives/Public/public-vocabs/2013Aug/0120.html

    "I noticed the use of the word "antagonym" popped up frequently to describe the relationship 
    to another action that causes the reverse result. e.g: http://schema.org/AcceptAction 
    says the related action RejectAction is "The antagonym of AcceptAction."
    However, an antagonym is a single word that has meanings that contradict
    each other. ... I believe "antonym" was likely the intended term"