public DefaultSparqlEndpoint(DataSource datasource) {
this.req = null;
this.res = null;
this.params = new HashMap<String, String>();
this.query = null;
this.datasource = new DataSourceImpl(datasource);
this.limit = null;
this.prefixes = PrefixMapping.Factory.create();
this.resultsCss = null;
this.resultsTpl = null;
this.charset = null; // bundle.getString("su4j.endpoint.http.charset");