# EIP-6239

每个合约必须实现`ISemanticSBT`接口

* 在有新的SBT产生的时候，需要发出`CreateRDF`事件
* 在更新已有SBT的RDF的时候，需要发出`UpdateRDF`事件
* 在销毁SBT的时候，需要发出`RemoveRDF`事件
* 合约需要提供`rdfOf`方法

```solidity
interface ISemanticSBT{
    /**
     * @dev This emits when minting a Semantic Soulbound Token.
     * @param tokenId The identifier for the Semantic Soulbound Token.
     * @param rdfStatements The RDF statements for the Semantic Soulbound Token. An RDF statement is the statement made by an RDF triple.
     */
    event CreateRDF (
        uint256 indexed tokenId,
        string  rdfStatements
    );
    /**
     * @dev This emits when updating the RDF data of Semantic Soulbound Token. RDF data is a collection of RDF statements that are used to represent information about resources.
     * @param tokenId The identifier for the Semantic Soulbound Token.
     * @param rdfStatements The RDF statements for the semantic soulbound token. An RDF statement is the statement made by an RDF triple.
     */
    event UpdateRDF (
        uint256 indexed tokenId,
        string  rdfStatements
    );
/**
     * @dev This emits when burning or revoking Semantic Soulbound Token.
     * @param tokenId The identifier for the Semantic Soulbound Token.
     * @param rdfStatements The RDF statements for the Semantic Soulbound Token. An RDF statement is the statement made by an RDF triple.
     */
    event RemoveRDF (
        uint256 indexed tokenId,
        string  rdfStatements
    );
    /**
     * @dev Returns the RDF statements of the Semantic Soulbound Token. An RDF statement is the statement made by an RDF triple.
     * @param tokenId The identifier for the Semantic Soulbound Token.
     */
    function rdfOf(uint256 tokenId) external view returns (string memory);
}
```

可以选择性的实现`ISemanticRDFSchema`接口，用于获取描述RDF数据的Schema URI。

```Solidity
interface ISemanticRDFSchema{
    /**
     * @notice Get the URI of schema for this contract.
     * @return The URI of the contract which point to a configuration profile.
     */
    function schemaURI() external view returns (string memory);
}
```

可以选择性的实现`ISemanticSBTUpdate`接口，用于更新SBT的RDF数据

```Solidity
interface ISemanticSBTUpdate{
    /**
     * @notice Update the RDF data for Semantic Soulbound Token. Implementors can assign updaters as needed, for example, the token issuer.
     * @dev Emits the `UpdateRDF` event.
     * @param tokenId The identifier for the Semantic Soulbound Token.
     * @param rdfData RDF data is a collection of RDF statements that are used to represent information about resources.
     */
    function updateRDF(uint256 tokenId, RDFData memory rdfData) external;
}
```

可以选择性的实现`ISemanticSBTPrivacy`接口

```solidity
interface ISemanticSBTPrivacy is ISemanticSBT {
    /**
     * @dev Returns if the `viewer` is allowed to view the `tokenId` .
     * @param viewer The viewer address
     * @param tokenId The token Id
     */
    function isViewerOf(address viewer, uint256 tokenId) external view returns (bool);
}
```