<summary>
The <summary> element contains a text summary
         associated with a book event (such as <approved> or <reviewed>)
         or with the list of copyrights for the book. 
      
      Content models
See appendix for information about this element in OASIS document type shells.
Inheritance
- topic/ph bookmap/summary
Example
<bookchangehistory>
  <edited>
    <person>Joe T. Editor</person>
    <revisionid>1</revisionid>
    <completed><year>2008</year><month>03</month><day>15</day></completed>
    <summary>Added several new topics</summary>
  </edited>
  <edited>
    <person>Joe T. Editor</person>
    <revisionid>2</revisionid>
    <completed><year>2008</year><month>10</month><day>13</day></completed>
    <summary>Fixed a few typos</summary>
  </edited>
</bookchangehistory>Attributes
The following attributes are available on this element: Universal attribute group, @outputclass, and @keyref.