code: public void delete(String name) throws IOException {
          if (name.equalsIgnoreCase(IS_CA)) {
              ca = false;
          } else if (name.equalsIgnoreCase(PATH_LEN)) {
              pathLen = -1;
          } else {
            throw new IOException("Attribute name not recognized by " +
                                  "CertAttrSet:BasicConstraints.");
          }
          encodeThis();
      }
docs: Delete the attribute value.