public Boolean dropGraph(String graphURI) {
		this.dropGraphs.add(graphURI);
		if(this.autoCommit){
			//TODO ändern!!!
			this.beginTransaction();
			Boolean ret = this.commit();
			this.endTransaction();
			if(ret){
				this.dropGraphs.clear();
			}
			return ret;
		}
		return null;
	}