/*
  Library - sample system 
  Last updated: May 22, 2008
*/
//Namespace for facade class.
namespace library

//Namespace for core of the system.
namespace library.core

class PartOfPublication{
 title; pageNumber;
 1 -- * PartOfPublication subparts;
}

class Copy{ barCodeNumber;}

class EditionOrIssue{
 issueNumber; 
 publishedDate;
 1 -- * PartOfPublication tableOfContents;
 1 -- * Copy;
}

class Publisher {
 name;
 1 -- * EditionOrIssue;
}

class Author {
 name;
 * -- * EditionOrIssue;
}

class EditionOfBook{ isbn; libOfCongress; isA EditionOrIssue; }

class IssueOfPeriodical { volume; isA EditionOrIssue; }

class Publication {
 name;
 1 -- * EditionOrIssue;
}

class Periodical { issn; frequency; isA Publication; }

class Book { isA Publication; }