interface EIP2981 is ERC165 {
	/// 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
);

/// @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