def print_all
            output_all do |document, options|
                if @documents.size > 1 then
                    puts '-' * document.name.length
                    puts document.name
                    puts '-' * document.name.length
                end
                puts document.xml.to_xml(options)
            end
        end
def print_all
            output_all do |document, options|
                if @documents.size > 1 then
                    puts '-' * document.name.length
                    puts document.name
                    puts '-' * document.name.length
                end
                puts document.xml.to_xml(options)
            end
        end
Print all loaded XML files

 Pretty prints the XML if {#pretty} is enabled. If more than one file is loaded, a header with the file's name
 is printed before each file.

 @return [void]