ex relationships within the site, such as links between pages in different sections of the site. The site maps for some large sites use headings that expand to show additional detail about each section.</p>
      <p>A site map describes the contents and organization of a site. It is important that site maps be updated whenever the site is updated. For example, a Web page is not a valid site map when any one of the following is true:</p>
      <ol>
         <li>it does not link to all the sections of a site,