A page break may be associated with a facsimile image of the page it introduces by means of the facs attribute
<body> <pb n="1" facs="page1.png"/> <!-- page1.png contains an image of the page;
the text it contains is encoded here --> <p> <!-- ... --> </p> <pb n="2" facs="page2.png"/> <!-- similarly, for page 2 --> <p> <!-- ... --> </p> </body>