Triple store/Updating OBO

To describe the strategy with keeping update. The basic strategy is to read the metadata, including the md5 signatures and download anything that has an md5 different from last time. Each ontology will go in a graph with the name of the ontology. In a graph about the graphs we will add assertions that associate information about the update with the graph, such as the md5. When an ontologyis updated we will drop the graph and reload the new one.


 * (pprint (xmls::parse (get-url "http://berkeleybop.org/ontologies/obo-all/ontology_index.xml")))