- Allow connection ports for relations ([#37](https://git-st.inf.tu-dresden.de/jastadd/ragconnect/-/issues/37)) and attributes ([#38](https://git-st.inf.tu-dresden.de/jastadd/ragconnect/-/issues/38))
- attributes ([#38](https://git-st.inf.tu-dresden.de/jastadd/ragconnect/-/issues/38)), especially collection and circular attributes ([#53](https://git-st.inf.tu-dresden.de/jastadd/ragconnect/-/issues/53))