Stores in the metadata of an endpoint (resp endpoint/namedgraph) in
METADATA_LOAD_DIR: labels, sameas, types.

Stores in $METADATA_LOAD_DIR the metadata of an endpoint (resp endpoint/namedgraph): labels,
Note that results are aggregated (cf view_help aggregatedata for more info).
Example:
retrieve_endpoint_metadata $HOME/.tmp http://dbpedia.datao.net/sparql http://dbpedia.org/