add convenience functions
add convenience functions

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