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<p>and conceptual query technology for <a href="page.php?w=information_systems">information systems</a>, using a business rules approach".</p>

<p><big> Object-role modeling </big></p>
<p>With his doctoral thesis Halpin (1989) formalized <a href="page.php?w=object-role_modeling">object-role modeling</a> (ORM), a "method for designing and querying <a href="page.php?w=database_model">database model</a>s at the conceptual level, where the application is described in terms easily understood by non-technical users".</p>

<p><big> Publications </big></p>
<p>Halpin has</p><p>
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