AIIRE is a free open source natural language processor, developed by a team of researchers in Saint-Petersburg, Russia. AIIRE is an implementation of full-scale NLU process, based on the method of inter-level interaction and rule-based disambiguation. Semantic graphs that are built by AIIRE are based on the involved ontology. The rules that concern correspondence between semantic relations (used in semantic graphs by AIIRE) and conceptual relations (used in ontology) is a matter of discussion. Semantic graphs are evaluated from syntactic trees, and, in general, although word-independent syntactic constituent classes tend to denote rather abstract relations (cf. genitive construction in general), the instances of those classes (specific phrases) in theory may denote any subclasses of those relations. The developed algorithm of choosing a relation subclass in each case is also a matter of discussion.