|- valign="top" scope="row"
|<code>doc</code>
| The argument specified via {{Code|fn:doc }} must yield a single document.
|<code>doc('db-collection')</code>
|- valign="top" scope="row"
|<code>permission</code>
| The current user has insufficient [[User Management|permissions]] to open a database, update nodes, etc.
|<code>db:preget('admin')</code>
|- valign="top" scope="row"
|<code>restxq</code>