# File lib/rexml/document.rb, line 34
                def initialize( source = nil, context = {} )
      @entity_expansion_count = 0
                        super()
                        @context = context
                        return if source.nil?
                        if source.kind_of? Document
                                @context = source.context
                                super source
                        else
                                build(  source )
                        end
                end