d><p>A point in time.</p></td></tr><tr id=ValueType-IP_ADDRESS><td><code>IP_ADDRESS</code></td><td><p>An IP address.</p></td></tr><tr id=ValueType-EMAIL_ADDRESS><td><code>EMAIL_ADDRESS</code></td><td><p>An email address.</p></td></tr><tr id=ValueType-URI><td><code>URI</code></td><td><p>A URI.</p></td></tr><tr id=ValueType-DNS_NAME><td><code>DNS_NAME</code></td><td><p>A DNS name.</p></td></tr><tr id=ValueType-DURATION><td><code>DURATION</code></td><td><p>A span between two points in time.</p></td></tr><tr id