docs: public Coding getTag(String theSystem, String theCode) {
          for (Coding next : getTag()) {
            if (ca.uhn.fhir.util.ObjectUtil.equals(next.getSystem(), theSystem) && ca.uhn.fhir.util.ObjectUtil.equals(next.getCode(), theCode)) {
              return next;
            }
          }
          return null;
        }