https://terminology.hl7.org/LOINC.html says: "The canonical URL http://loinc.org/rdf#[LOINC code] can be used to refer to logical model elements defined by LOINC such as e.g. in Questionnaire.item.definition."

But the correct IRI stem for LOINC is http://loinc.org/rdf/ -- with a "/", not a "#".

@gaurav