The XML feed is made up of a single <guestbook> element, containing zero or more <gbentry> elements and a single
    <signlink> element. The <guestbook> element has no attributes.
    The <signlink> element has an attribute "href", which contains the URL of the guest book signing page. The element body
    contains the text "Sign book", but this likely to become customizable.
    A <gbentry> element will always contain a <gbposter> element, which contains the name of the person making that
    guest book entry. This element has no attributes.
    A <gbentry> element may contain a <gbemail> element if the person signing the book gave their email address. It has an
    attribute "addr" which holds the email address. The element body contains the text/image URL you have selected to appear on
    your guestbook.
    A <gbentry> element may contain a <gbhomepage> element if the person signing the book gave their homepage address. It
    has an attribute "href" which holds the URL. The element body contains the text/image URL you have selected to appear on your
    guestbook.
    A <gbentry> element will always contain a <gbdate> element, which contains the date the entry was made. It has no
    attributes.
    A <gbentry> element will always contain a <gbtext> element, which contains the body of the guestbook entry. It has no
    attributes.
    
  
For clarity, here is an example of a complete XML feed:
  <guestbook>
    <gbentry>
      <gbposter>Someone</gbposter>
      <gbemail addr="someone@somewhere">Mail</gbemail>
      <gbdate>23 Mar 04 19:30:30 GMT</gbdate>
      <gbtext>Hello</gbtext>
    </gbentry>
    <gbentry>
      <gbposter>Someone else</gbposter>
      <gbemail addr="someone@somewhere">Mail</gbemail>
      <gbhomepage href="http://somewhere">Web</gbhomepage>
      <gbdate>22 Mar 04 22:00:00 GMT</gbdate>
      <gbtext>Test</gbtext>
      </gbentry>
    <signlink href="http://www.guest-book.co.uk/book/test&action=sign">Sign book</signlink>
  </guestbook>