Some entry and feed attributes defined in class Restfulie::Common::Builder::Marshalling::Atom doesn't work

Restfulie must implement all attributes already defined in atom.rb file :

  ATOM_ATTRIBUTES = [
    :title, :id, :updated, # Required
    :author, :links, # Recommended
    :category, :contributor, :rights # Optional
  ]
  
  ATOM_ATTRIBUTES_ENTRY = ATOM_ATTRIBUTES + [
    :content, :summary, # Required
    :published, :source # Optional
  ]
  
  ATOM_ATTRIBUTES_FEED = ATOM_ATTRIBUTES + [
    :generator, :icon, :logo, :subtitle # Optional
  ]

Some attributes that doesn't work: author and category. I don't know if the others attributes are working.