// SPDX-License-Identifier: MIT

pragma solidity >=0.7.6 <0.8.0;

/**
 * @title ERC1155 Multi Token Standard, optional extension: Metadata URI.
 * @dev See https://eips.ethereum.org/EIPS/eip-1155
 * @dev Note: The ERC-165 identifier for this interface is 0x0e89341c.
 */
interface IERC1155MetadataURI {
    /**
     * @notice A distinct Uniform Resource Identifier (URI) for a given token.
     * @dev URIs are defined in RFC 3986.
     * @dev The URI MUST point to a JSON file that conforms to the "ERC1155 Metadata URI JSON Schema".
     * @dev The uri function SHOULD be used to retrieve values if no event was emitted.
     * @dev The uri function MUST return the same value as the latest event for an _id if it was emitted.
     * @dev The uri function MUST NOT be used to check for the existence of a token as it is possible for
     *  an implementation to return a valid string even if the token does not exist.
     * @return URI string
     */
    function uri(uint256 id) external view returns (string memory);
}