This is the Title of the Book, eMatter Edition Copyright © 2003 OReilly & Associates, Inc. All rights reserved. 26 Chapter 4 CHAPTER 4 RSS 0.91, 0.92, and 2.0 (Really  Simple  Syndication) Its so simple to be happy, but so difficult to be simple. Gururaj Ananda Yogi In this chapter we examine the RSS 0.91, 0.92, and 2.0 specifications in detail. We also show how to create your own feeds and use those created by others. RSS 0.91 The version documented in this section is based on the Userland document of April 2000   (currently   found   at   Its   author,   Dave Winer,  did  not  invent  any  new  practices  with  this  specification,  but  he  did  codify RSS in a far more precise way than the Netscape original (at publish/formats/rss-spec-0.91.html),  based  on  common  practice  at  the  time.  Prima- rily, the new codification imposed limits on the number of characters allowed within each element. The  only  major  difference  between  the  Userland  spec  and  the  original  Netscape write-up is that the Userland version lacks a document type definition (DTD) decla- ration. In fact, Netscape RSS 0.91 is the only RSS version with an official DTD, so most RSS parsers are used to dealing without one. Including the declaration is there- fore a matter of personal preference (though it must be noted that useful character entities  such  as  &trade;  cannot  be  used  without  it).  Example 4-1  provides  a  DTD declaration for those who wish to use one. Example 4-1. The top of an RSS 0.91 document, with a DTD declaration <?xml version="1.0"?> <!DOCTYPE rss PUBLIC "-//Netscape Communications//DTD RSS 0.91//EN" "http://my.netscape. com/publish/formats/rss-0.91.dtd"> <rss version="0.91">