In BaseX, they can be specified in several ways:
* by using the <code>-s</code> flag of the BaseX [[Startup_Options#BaseX_StandaloneBaseX|BaseX Standalonecommand-line]] clientclients,
* by setting the [[Options#Query options|SERIALIZER]] option before running a query,
* by setting the [[Options#Query options|EXPORTER]] option before exporting a database,