Type</th><th>Description</th></tr></thead><tbody><tr id=Subject-user><td><code>user</code></td><td><code>string</code></td><td><p>Optional. The user name/ID that the subject represents.</p></td></tr><tr id=Subject-properties><td><code>properties</code></td><td><code>map&lt;string,&nbsp;string&gt;</code></td><td><p>Optional. The set of properties that identify the subject.</p></td></tr></tbody></table></section></article><nav class=pagenav><div class=left><a title="Describes the supported constraints and pro