docs: protected AllergyIntoleranceReactionComponent processAdverseReactionObservation(Element reaction) throws Exception {
  		checkNoNegationOrNullFlavor(reaction, "Adverse Reaction Observation");
  		checkNoSubject(reaction, "Adverse Reaction Observation");
  
  		// This clinical statement represents an undesired symptom, finding, etc., due to an administered or exposed substance. A reaction can be defined with respect to its	severity, and can have been treated by one or more interventions.
  		AllergyIntoleranceReactionComponent ar = new AllergyIntoleranceReactionComponent();
  
  		// SHALL contain exactly one [1..1] id (CONF:7329).
  		for (Element e : cda.getChildren(reaction, "id"))
  			ToolingExtensions.addIdentifier(ar, convert.makeIdentifierFromII(e));
  
  		// SHALL contain exactly one [1..1] code (CONF:7327). The value set for this code element has not been specified.
  		// todo: what the heck is this?
  
  		// SHOULD contain zero or one [0..1] text (CONF:7330).
  		// todo: so what is this? how can we know whether to ignore it?
  
  		// 8.  SHOULD contain zero or one [0..1] effectiveTime (CONF:7332).
  		//  	a.  This effectiveTime SHOULD contain zero or one [0..1] low (CONF:7333).
  		//  	b.  This effectiveTime SHOULD contain zero or one [0..1] high (CONF:7334).
  		// !this is a problem because FHIR just has a date, not a period.
  		ar.setOnsetElement(convert.makeDateTimeFromIVL(cda.getChild(reaction, "effectiveTime")));
  
  		// SHALL contain exactly one [1..1] value with @xsi:type="CD", where the @code SHALL be selected from ValueSet 2.16.840.1.113883.3.88.12.3221.7.4 Problem	DYNAMIC (CONF:7335).
  		ar.getManifestation().add(convert.makeCodeableConceptFromCD(cda.getChild(reaction, "value")));
  
  		// SHOULD contain zero or one [0..1] entryRelationship (CONF:7580) such that it SHALL contain exactly one [1..1] Severity Observation  (templateId:2.16.840.1.113883.10.20.22.4.8) (CONF:7582).
  		ar.setSeverity(readSeverity(cda.getSeverity(reaction)));
  
  		// MAY contain zero or more [0..*] entryRelationship (CONF:7337) such that it SHALL contain exactly one [1..1] Procedure Activity Procedure (templateId:2.16.840.1.113883.10.20.22.4.14) (CONF:7339).
  		// i.  This procedure activity is intended to contain information about procedures that were performed in response to an allergy reaction
  		// todo: process these into an procedure and add as an extension
  
  		// MAY contain zero or more [0..*] entryRelationship (CONF:7340) such that it SHALL contain exactly one [1..1] Medication Activity (templateId:2.16.840.1.113883.10.20.22.4.16) (CONF:7342).
  		// i.  This medication activity is intended to contain information about medications that were administered in response to an allergy reaction. (CONF:7584).
  		// todo: process these into an medication statement and add as an extension
  
  		return ar;
  	}