# File src/rexml/doctype.rb, line 40
                def initialize( first, parent=nil )
                        @entities = DEFAULT_ENTITIES
                        @long_name = @uri = nil
                        if first.kind_of? String
                                super()
                                @name = first
                                @external_id = parent
                        elsif first.kind_of? DocType
                                super( parent )
                                @name = first.name
                                @external_id = first.external_id
                        elsif first.kind_of? Array
                                super( parent )
                                @name = first[0]
                                @external_id = first[1]
                                @long_name = first[2]
                                @uri = first[3]
                        end
                end