anchor.diff:  library xml_examples;
   
  -var booksXml =
  +const booksXml =
       '<?xml version="1.0"?>'
       '<catalog>'
       '   <book id="bk101">'
  
positive.code:     '  </book>\n'
      '</bookstore>';
  
  var atomXml =
      '<?xml version="1.0" encoding="UTF-8"?>'
      '<app:service>'
      '  <app:workspace>'
  
negative.code:     '   </book>'
      '</catalog>';
  
  const bookstoreXml =
      '<?xml version="1.0" encoding="ISO-8859-1"?>\n'
      '<bookstore>\n'
      '  <book>\n'
  