@elf-pavlik The underlying code for shrinking and expanding doesn't matter. It's possible to access the "raw" RDF-Ext graph via .graph(), but SimpleRDF is a high level API and will abstract many RDF-Ext APIs for simpler usage. You shouldn't rely on the low level API. This allows us to change stuff on the low level. e.g. switch from RDF-Ext 0.3.x to 1.x. But remember what the readme says: "Attention: this library is work in progress". The API of SimpleRDF is not final yet!