add support for abstract metadata and DataURL
add support for abstract metadata and DataURL

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