class ActiveFedora::Base

def self.pids_from_uris(uris) 
  if uris.class == String
    return uris.gsub("info:fedora/", "")
  elsif uris.class == Array
    arr = []
    uris.each do |uri|
      arr << uri.gsub("info:fedora/", "")
    end
    return arr
  end
end