Expression laguage is used widely in various placed in Oracle HCM and ERP. Here are some of the samples of usage while exposing Pages/Tiles in HCM and ERP.
#{securityContext.userInRole['TEST_ROLE']}
#{securityContext.userGrantedResource['resourceType=FNDResourceType;resourceName=FND_Scheduled_Processes_Menu;action=launch'] or !securityContext.userInRole['OFD_SALES_REP_CUSTOM_JOB,OFD_SALES_MGR_VP_CUSTOM_JOB']}
#{securityContext.userInAllRoles['role1,role2,roleN']}
#{securityContext.userName=='user 1' || securityContext.userName=='user 2' || securityContext.userName=='user 3'}
