services.</p></td></tr><tr id=AccessRule-constraints><td><code>constraints</code></td><td><code><a href=#AccessRule-Constraint>AccessRule.Constraint[]</a></code></td><td><p>Optional. Extra constraints in the ServiceRole specification.</p></td></tr></tbody></table></section><h2 id=AccessRule-Constraint>AccessRule.Constraint</h2><section><p>Definition of a custom constraint. The supported keys are listed in the &ldquo;constraint and properties&rdquo; page.</p><table class=message-fields><thead><tr><th>Field</