docs: public HFCAAffiliation getChild(String name) throws AffiliationException, InvalidArgumentException {
          if (this.deleted) {
              throw new AffiliationException("Affiliation has been deleted");
          }
          validateSingleAffiliationName(name);
          for (HFCAAffiliation childAff : this.childHFCAAffiliations) {
              if (childAff.getName().equals(this.name + "." + name)) {
                  return childAff;
              }
          }
          return null;
      }