minor fix to remove hardcoded identifier selection
minor fix to remove hardcoded identifier selection

PublicaMundi/pycsw,benhowell/pycsw,ckan-fcd/pycsw-fcd,ricardogsilva/pycsw,ricardogsilva/pycsw,kevinpdavies/pycsw,benhowell/pycsw,bukun/pycsw,geopython/pycsw,ocefpaf/pycsw,tomkralidis/pycsw,kalxas/pycsw,kevinpdavies/pycsw,ricardogsilva/pycsw,ocefpaf/pycsw,kalxas/pycsw,mwengren/pycsw,ingenieroariel/pycsw,kalxas/pycsw,mwengren/pycsw,ckan-fcd/pycsw-fcd,PublicaMundi/pycsw,rouault/pycsw,geopython/pycsw,rouault/pycsw,bukun/pycsw,bukun/pycsw,ingenieroariel/pycsw,tomkralidis/pycsw,tomkralidis/pycsw,geopython/pycsw