add sort docs
add sort docs

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