code: public void set(String name, Object obj) throws IOException {
          if (name.equalsIgnoreCase(ISSUER_NAME)) {
              if (!(obj instanceof GeneralNames)) {
                throw new IOException("Attribute value should be of" +
                                      " type GeneralNames.");
              }
              names = (GeneralNames)obj;
          } else {
            throw new IOException("Attribute name not recognized by " +
                          "CertAttrSet:IssuerAlternativeName.");
          }
          encodeThis();
      }
docs: Set the attribute value.