Within SOPHIS Project No.2 „Ontology-based knowledge engineering technologies suitable for web environment” Institute of Mathematics and Computer Science (IMCS) has used the prototype of the developed ad hoc query language and tool in the Children’s Clinical University Hospital’s (CCUH) Anesthesiology and Intensive Care Clinic for the data analysis and report preparation. The first results showed that professionals with no more experience in data processing technologies than using spreadsheet tables themselves could formulate appropriate queries. At the same time the experiments showed the existing problems in the query language implementations.