The module is an attempt to make an alternative way to query the relations between entities. It uses selectors to manipulate the internal set of selected claims, where such selectors can be chained to form more complex propositions. In a final step parts of the internal structure of the claims or even the entities can be returned. The final step will involve an implicit filter operation, so nil will not be returned if possible. The implicit filtering will not change the internal selection, thus further processing of the selection is still possible.