docs: public static String getUriForOid(String r) {
  		if (r.equals("2.16.840.1.113883.6.96"))
  			return "http://snomed.info/sct";
  		if (r.equals("2.16.840.1.113883.6.1"))
  			return "http://loinc.org";
  		if (r.equals("2.16.840.1.113883.6.8"))
  			return "http://unitsofmeasure.org";
  		if (r.equals("2.16.840.1.113883.6.3"))
  			return "http://hl7.org/fhir/sid/icd-10";
  		if (r.equals("2.16.840.1.113883.6.42"))
  			return "http://hl7.org/fhir/sid/icd-9";
  		if (r.equals("2.16.840.1.113883.6.104"))
  			return "http://hl7.org/fhir/sid/icd-9";
  		if (r.equals("2.16.840.1.113883.6.103"))
  			return "http://hl7.org/fhir/sid/icd-9"; //todo: confirm this		
  		if (r.equals("2.16.840.1.113883.6.73"))
  			return "http://hl7.org/fhir/sid/atc";
  		if (r.equals("2.16.840.1.113883.3.26.1.1"))
  			return "http://ncimeta.nci.nih.gov";
  		if (r.equals("2.16.840.1.113883.3.26.1.1.1"))
  			return "http://ncimeta.nci.nih.gov";
  		if (r.equals("2.16.840.1.113883.6.88"))
  			return "http://www.nlm.nih.gov/research/umls/rxnorm"; // todo: confirm this
  
  		if (r.equals("2.16.840.1.113883.5.1008"))
  			return "http://terminology.hl7.org/v3/NullFlavor";
  		if (r.equals("2.16.840.1.113883.5.111"))
  			return "http://terminology.hl7.org/v3/RoleCode";
  		if (r.equals("2.16.840.1.113883.5.4"))
  			return "http://terminology.hl7.org/v3/ActCode";
  		if (r.equals("2.16.840.1.113883.5.8"))
  			return "http://terminology.hl7.org/v3/ActReason";
  		if (r.equals("2.16.840.1.113883.5.83"))
  			return "http://terminology.hl7.org/v3/ObservationInterpretation";
  		if (r.equals("2.16.840.1.113883.6.238"))
  			return "http://terminology.hl7.org/v3/Race";
  
  		if (r.equals("2.16.840.1.113883.6.59"))
  			return "http://hl7.org/fhir/sid/cvx";
  		if (r.equals("2.16.840.1.113883.12.292"))
  			return "http://hl7.org/fhir/sid/cvx";
  
  		if (r.equals("2.16.840.1.113883.6.12"))
  			return "http://www.ama-assn.org/go/cpt";
  
  		if (r.startsWith("2.16.840.1.113883.12."))
  			return "http://hl7.org/fhir/sid/v2-"+r.substring(21);
  		return null;
  	}