rviceRoleBinding-roleRef><td><code>roleRef</code></td><td><code><a href=#RoleRef>RoleRef</a></code></td><td><p>Required. Reference to the ServiceRole object.</p></td></tr></tbody></table></section><h2 id=Subject>Subject</h2><section><p>Subject defines an identity. The identity is either a user or identified by a set of <code>properties</code>.
The supported keys in <code>properties</code> are listed in &ldquo;constraint and properties&rdquo; page.</p><table class=message-fields><thead><tr><th>Field</th><th>