This module allows for rdf_load('http://...’. 
It exploits the library library(http/http_open.pl). The 
format of the URL is determined from the mime-type returned by the 
server if this is one of
text/rdf+xml, application/x-turtle or
application/turtle. As RDF mime-types are not yet widely 
supported, the plugin uses the extension of the URL if the claimed 
mime-type is not one of the above. In addition, it recognises
text/html and application/xhtml+xml, scanning 
the XML content for embedded RDF.