# File lib/rgen/fragment/model_fragment.rb, line 72
  def set_root_elements(root_elements, options={})
    @root_elements = root_elements 
    @elements = options[:elements]
    @index = options[:index]
    @unresolved_refs = options[:unresolved_refs]
    @resolved_refs = nil 
    # new unresolved refs, reset removed_urefs

    @removed_urefs = nil
    @changed = false
  end