...lidity
/// @notice Returns the State struct of a position, given an owner and position boundaries
/// @param self The mapping containing all user positions
/// @param owner The address of the position owner
/// @param tickLower The lower tick boundary of the position
/// @param tickUpper The up...
....to/aseneca/cross-pro...](https://dev.to/aseneca/cross-program-invocations-and-pdas-the-combination-of-two-powerful-mechanism-on-anchor-4b93)
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...下：
```javascript
/**
* @title ERC-6150 Hierarchical NFTs Token Standard
* @dev See https://eips.ethereum.org/EIPS/eip-6150
* Note: the ERC-165 identifier for this interface is 0x897e2c73.
*/
interface IERC6150 is IERC721, IERC165 {
/**
* @notice Emitted when `tokenId` tok...