module RubyXL::RelationshipSupport

def store_relationship(related_file, unknown = false)
  self.generic_storage ||= []
  if unknown && !RubyXL.class_variable_get(:@@suppress_warnings) then
    puts "WARNING: #{self.class} is not aware how to process #{related_file.class}"
  end
  self.generic_storage << related_file
end