May I ask you about the status of this issue. We are developing a terminology authoring tool (Snow Owl), and trying to add support for LOINC too, including a hierarchical representation of the parts and codes. The LOINC.csv and the multi-axial hierarchy file do not seem to include the class hierarchy and the hierarchy for the clinical content and the type. Do you already have this information available somewhere else other than the RELMA database? Thank you for your help.