# File lib/rgen/fragment/model_fragment.rb, line 256
  def collect_unresolved_refs
    unresolved_refs = []
    elements.each do |e|
      each_reference_target(e) do |r, t|
        if t.is_a?(RGen::MetamodelBuilder::MMProxy)
          unresolved_refs << 
            RGen::Instantiator::ReferenceResolver::UnresolvedReference.new(e, r.name, t)
        end
      end
    end
    unresolved_refs
  end