interface IERC2981 is IERC165 {
  // ERC165 bytes to add to interface array - set in parent contract
  // implementing this standard
  //
  // bytes4(keccak256("royaltyInfo(uint256,uint256)")) == 0x2a55205a
  // bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
  // _registerInterface(_INTERFACE_ID_ERC2981);

  // @notice Called with the sale price to determine how much royalty
  //  is owed and to whom.
  // @param _tokenId - the NFT asset queried for royalty information
  // @param _salePrice - the sale price of the NFT asset specified by _tokenId
  // @return receiver - address of who should be sent the royalty payment
  // @return royaltyAmount - the royalty payment amount for _salePrice

  function royaltyInfo(uint256 _tokenId, uint256 _salePrice) external view returns (address receiver, uint256 royaltyAmount);

}
///
/// @dev Interface for the NFT Royalty Standard
///
function royaltyInfo(uint256 _tokenId, uint256 _salePrice) external view returns (address receiver, uint256 royaltyAmount);
// ERC165 bytes to add to interface array - set in parent contract
// implementing this standard
//
// bytes4(keccak256("royaltyInfo(uint256,uint256)")) == 0x2a55205a
// bytes4 private constant _INTERFACE_ID_ERC2981 = 0x2a55205a;
// _registerInterface(_INTERFACE_ID_ERC2981);
// @notice Called with the sale price to determine how much royalty
//  is owed and to whom.
// @param _tokenId - the NFT asset queried for royalty information
// @param _salePrice - the sale price of the NFT asset specified by _tokenId
// @return receiver - address of who should be sent the royalty payment
// @return royaltyAmount - the royalty payment amount for _salePrice