MarkLogic 12 EA 1 Product Documentation
xdmp:user-privileges

xdmp:user-privileges(
   $user as xs:string,
   [$extSecId as xs:unsignedLong],
   [$secDbFirst as xs:boolean]
) as xs:unsignedLong*

Return IDs of all privileges that a user have.

Parameters
user	A user name.
extSecId	An external security config ID to search. This is needed only to find an external user. The default is the current App Server's external-security setting.
secDbFirst	A boolean value to specify whether to check security database before any specified external security. The default is the current App Server's internal-security setting, or true when running on the task server.

http://marklogic.com/xdmp/privileges/xdmp-user-privileges

xdmp:user-privileges("ian")
=> (239871567325, 432987324)

MarkLogic 12 EA 1 Product Documentationxdmp:user-privileges