interface ERC721Metadata
{

  /**
   * @dev Returns a descriptive name for a collection of NFTs in this contract.
   * @return _name Representing name.
   */
  function name()
    external
    view
    returns (string memory _name);

  /**
   * @dev Returns a abbreviated name for a collection of NFTs in this contract.
   * @return _symbol Representing symbol.
   */
  function symbol()
    external
    view
    returns (string memory _symbol);

  /**
   * @dev Returns a distinct Uniform Resource Identifier (URI) for a given asset. It Throws if
   * `_tokenId` is not a valid NFT. URIs are defined in RFC3986. The URI may point to a JSON file
   * that conforms to the "ERC721 Metadata JSON Schema".
   * @return URI of _tokenId.
   */
  function tokenURI(uint256 _tokenId)
    external
    view
    returns (string memory);

}
/**
 * @dev Optional metadata extension for ERC-721 non-fungible token standard.
 * See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md.
 */
function symbol()
    external
    view
    returns (string memory _symbol);
/**
 * @dev Returns a abbreviated name for a collection of NFTs in this contract.
 * @return _symbol Representing symbol.
 */