$Revision$
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set — A collection of books
set ::= ((title,subtitle?,titleabbrev?)?,setinfo?,toc?, (set|book)+,setindex?)
| 
                         Name  | 
                     
                         Type  | 
                     
                         Default  | 
                  
| status | CDATA | None | 
| fpi | CDATA | None | 
               A Set is a collection of Books. Placing multiple
               Books in a Set, as opposed to publishing each
               of them separately, has the advantage that ID/IDREF links can then
               be used across all books.
               
            
               Set is the very top of the DocBook structural hierarchy.
               There's nothing that contains a Set.
               
            
                        FPI holds the Formal Public Identifier for
                        the Set.
                        
                     
                        Status identifies the editorial or publication 
                        status of the Set.
                        
                     
Publication status might be used to control formatting (for example, printing a “draft” watermark on drafts) or processing (perhaps a document with a status of “final” should not include any components that are not final).
<!DOCTYPE set PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
          "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<set><title>The Perl Series</title>
<setinfo>
  <corpauthor>O'Reilly & Associates, Inc.</corpauthor>
</setinfo>
<book><title>Learning Perl</title>
<chapter><title>...</title><para>...</para></chapter>
</book>
<book><title>Programming Perl</title>
<chapter><title>...</title><para>...</para></chapter>
</book>
<book><title>Advanced Perl Programming</title>
<chapter><title>...</title><para>...</para></chapter>
</book>
</set>