Use the ? operator in the XPath parser
Use the ? operator in the XPath parser

ttasanen/oga,YorickPeterse/oga,jeffreybaird/oga,jeffreybaird/oga,ttasanen/oga,ttasanen/oga,YorickPeterse/oga,ttasanen/oga,ttasanen/oga,jeffreybaird/oga,YorickPeterse/oga,dfockler/oga,altmetric/oga,YorickPeterse/oga,jeffreybaird/oga,dfockler/oga,YorickPeterse/oga,altmetric/oga,jeffreybaird/oga,dfockler/oga,altmetric/oga,dfockler/oga,dfockler/oga,altmetric/oga,altmetric/oga