* Values can be changed with the [[Commands#SET|SET]] command and requested with the [[Commands#GET|GET]] command. All values are ''statically bound'' to a database session; they stay valid until they are changed once again by another operation.
* Options can also be set in the prolog of an XQuery expressionexpressions. In the option declaration, keys are need to be prefixed with {{Code|db:}}. All values will be reset after the evaluation of a query:
<pre class="brush:xquery">