interface IERC998ERC721TopDownEnumerable {
    /**
     * @notice Get the total number of child contracts with tokens that are owned by tokenId.
     * @param _tokenId The parent token of child tokens in child contracts
     * @return uint256 The total number of child contracts with tokens owned by tokenId.
     */
    function totalChildContracts(uint256 _tokenId)
        external
        view
        returns (uint256);

    /**
     * @notice Get child contract by tokenId and index
     * @param _tokenId The parent token of child tokens in child contract
     * @param _index The index position of the child contract
     * @return childContract The contract found at the tokenId and index.
     */
    function childContractByIndex(uint256 _tokenId, uint256 _index)
        external
        view
        returns (address childContract);

    /**
     * @notice Get the total number of child tokens owned by tokenId that exist in a child contract.
     * @param _tokenId The parent token of child tokens
     * @param _childContract The child contract containing the child tokens
     * @return uint256 The total number of child tokens found in child contract that are owned by tokenId.
     */
    function totalChildTokens(uint256 _tokenId, address _childContract)
        external
        view
        returns (uint256);

    /**
     * @notice Get child token owned by tokenId, in child contract, at index position
     * @param _tokenId The parent token of the child token
     * @param _childContract The child contract of the child token
     * @param _index The index position of the child token.
     * @return childTokenId The child tokenId for the parent token, child token and index
     */
    function childTokenByIndex(
        uint256 _tokenId,
        address _childContract,
        uint256 _index
    ) external view returns (uint256 childTokenId);
}
/**
 * @dev The ERC-165 identifier for this interface is 0xa344afe4
 */
function childTokenByIndex(
        uint256 _tokenId,
        address _childContract,
        uint256 _index
    ) external view returns (uint256 childTokenId);
/**
 * @notice Get child token owned by tokenId, in child contract, at index position
 * @param _tokenId The parent token of the child token
 * @param _childContract The child contract of the child token
 * @param _index The index position of the child token.
 * @return childTokenId The child tokenId for the parent token, child token and index
 */