# File TagTreeScanner.rb, line 572
                def tags_by_name( tag_name )
                        out = []
                        @child_tags.each{ |tag|
                                out << tag if tag.tag_name == tag_name
                                unless tag.child_tags.empty?
                                        out.concat( tag.tags_by_name( tag_name ) ) 
                                end
                        }
                        out
                end