# EIP-6239

Every contract of this kind should implement a `ISemanticSBT` interface.

* When a new SBT is created, a `CreateRDF` should be triggered.
* When a new SBT is updated, an `UpdateRDF` should be triggered.
* When a new SBT is removed, a `RemoveRDF` should be triggered.
* A contract of this kind should provide a method `rdfOf`.

```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);
}
```

Developers can choose to implement an `ISemanticRDFSchema` interface to acquire the Schema URI describing the RDF data.

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

Developers can choose to implement an `ISemanticSBTUpdate` interface to update the RDF data of an SBT.

```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;
}
```

Developers can choose to implement an `ISemanticSBTPrivacy` interface.

```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);
}
```


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