add type checking
add type checking

daf/OWSLib,geopython/OWSLib,KeyproOy/OWSLib,dblodgett-usgs/OWSLib,datagovuk/OWSLib,mbertrand/OWSLib,QuLogic/OWSLib,jachym/OWSLib,jaygoldfinch/OWSLib,kalxas/OWSLib,jaygoldfinch/OWSLib,kwilcox/OWSLib,Jenselme/OWSLib,robmcmullen/OWSLib,ocefpaf/OWSLib,datagovuk/OWSLib,daf/OWSLib,menegon/OWSLib,tomkralidis/OWSLib,bird-house/OWSLib,b-cube/OWSLib,datagovuk/OWSLib,daf/OWSLib,JuergenWeichand/OWSLib,gfusca/OWSLib,geographika/OWSLib