It assumes that we can identify the DTD with the relative URI reference "example.dtd"; the "people_list" after "!DOCTYPE" tells us that the root tags, or the first element defined in the DTD, is called "people_list":One can render this in an XML-enabled browser (such as Internet Explorer or Mozilla Firefox) by pasting and saving the DTD component above to a text file named "example.dtd" and the XML file to a differently-named text file, and opening the XML file with the browser.