Adds methods to get and set attributes metadata for a collection.

contracts/RMRK/extension/tokenAttributes/IERC7508.sol

@@ -105,6 +105,16 @@ interface IERC7508 is IERC165 {
         address specificAddress
     );
 
+    /**
+     * @notice Used to notify listeners that the metadata URI for a collection has been updated.
+     * @param collection Address of the collection
+     * @param attributesMetadataURI The new attributes metadata URI
+     */
+    event MetadataURIUpdated(
+        address indexed collection,
+        string attributesMetadataURI
+    );
+
     /**
      * @notice Used to notify listeners that a new collaborator has been added or removed.
      * @param collection Address of the collection
@@ -244,6 +254,26 @@ interface IERC7508 is IERC165 {
         bool[] memory collaboratorAddressAccess
     ) external;
 
+    /**
+     * @notice Used to retrieve the attributes metadata URI for a collection, which contains all the information about the collection attributes.
+     * @param collection Address of the collection
+     * @return attributesMetadataURI The URI of the attributes metadata
+     */
+    function getAttributesMetadataURI(
+        address collection
+    ) external view returns (string memory attributesMetadataURI);
+
+    /**
+     * @notice Used to set the metadata URI for a collection, which contains all the information about the collection attributes.
+     * @dev Emits a {MetadataURIUpdated} event.
+     * @param collection Address of the collection
+     * @param attributesMetadataURI The URI of the attributes metadata
+     */
+    function setAttributesMetadataURI(
+        address collection,
+        string memory attributesMetadataURI
+    ) external;
+
     /**
      * @notice Used to set a number attribute.
      * @dev Emits a {UintAttributeUpdated} event.

contracts/RMRK/extension/tokenAttributes/RMRKTokenAttributesRepository.sol

@@ -44,19 +44,22 @@ contract RMRKTokenAttributesRepository is IERC7508, Context {
             "setAddressAttribute(address collection,uint256 tokenId,string memory key,address value)"
         );
 
-    mapping(address collection => mapping(uint256 => AccessType))
+    mapping(address collection => mapping(uint256 parameterId => AccessType accessType))
         private _parameterAccessType;
-    mapping(address collection => mapping(uint256 => address))
+    mapping(address collection => mapping(uint256 parameterId => address specificAddress))
         private _parameterSpecificAddress;
-    mapping(address collection => IssuerSetting) private _issuerSettings;
-    mapping(address collection => mapping(address collaborator => bool))
+    mapping(address collection => IssuerSetting setting)
+        private _issuerSettings;
+    mapping(address collection => mapping(address collaborator => bool isCollaborator))
         private _collaborators;
 
     // For keys, we use a mapping from strings to IDs.
     // The purpose is to store unique string keys only once, since they are more expensive.
-    mapping(string => uint256) private _keysToIds;
-    uint256 private _totalAttributes;
+    mapping(string key => uint256 id) private _keysToIds;
+    uint256 private _nextKeyId;
 
+    mapping(address collection => string attributesMetadataURI)
+        private _attributesMetadataURIs;
     mapping(address collection => mapping(uint256 => mapping(uint256 => address)))
         private _addressValues;
     mapping(address collection => mapping(uint256 => mapping(uint256 => bytes)))
@@ -177,6 +180,26 @@ contract RMRKTokenAttributesRepository is IERC7508, Context {
         }
     }
 
+    /**
+     * @inheritdoc IERC7508
+     */
+    function getAttributesMetadataURI(
+        address collection
+    ) external view returns (string memory attributesMetadataURI) {
+        attributesMetadataURI = _attributesMetadataURIs[collection];
+    }
+
+    /**
+     * @inheritdoc IERC7508
+     */
+    function setAttributesMetadataURI(
+        address collection,
+        string memory attributesMetadataURI
+    ) external onlyIssuer(collection) {
+        _attributesMetadataURIs[collection] = attributesMetadataURI;
+        emit MetadataURIUpdated(collection, attributesMetadataURI);
+    }
+
     /**
      * @inheritdoc IERC7508
      */
@@ -1287,9 +1310,9 @@ contract RMRKTokenAttributesRepository is IERC7508, Context {
      */
     function _getIdForKey(string memory key) internal returns (uint256 keyID) {
         if (_keysToIds[key] == 0) {
-            _totalAttributes++;
-            _keysToIds[key] = _totalAttributes;
-            keyID = _totalAttributes;
+            _nextKeyId++;
+            _keysToIds[key] = _nextKeyId;
+            keyID = _nextKeyId;
         } else {
             keyID = _keysToIds[key];
         }

docs/RMRK/extension/tokenAttributes/IERC7508.md

@@ -90,6 +90,28 @@ Used to retrieve multiple token attributes of any type at once.
 | addressAttributes | address[] | An array of addresses, in the same order as the addressKeys |
 | bytesAttributes | bytes[] | An array of bytes, in the same order as the bytesKeys |
 
+### getAttributesMetadataURI
+
+```solidity
+function getAttributesMetadataURI(address collection) external view returns (string attributesMetadataURI)
+```
+
+Used to retrieve the attributes metadata URI for a collection, which contains all the information about the collection attributes.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| collection | address | Address of the collection |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| attributesMetadataURI | string | The URI of the attributes metadata |
+
 ### getBoolAttribute
 
 ```solidity
@@ -693,6 +715,23 @@ function setAttributes(address collection, uint256 tokenId, IERC7508.StringAttri
 | addressAttributes | IERC7508.AddressAttribute[] | undefined |
 | bytesAttributes | IERC7508.BytesAttribute[] | undefined |
 
+### setAttributesMetadataURI
+
+```solidity
+function setAttributesMetadataURI(address collection, string attributesMetadataURI) external nonpayable
+```
+
+Used to set the metadata URI for a collection, which contains all the information about the collection attributes.
+
+*Emits a {MetadataURIUpdated} event.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| collection | address | Address of the collection |
+| attributesMetadataURI | string | The URI of the attributes metadata |
+
 ### setBoolAttribute
 
 ```solidity
@@ -980,6 +1019,23 @@ Used to notify listeners that a new collaborator has been added or removed.
 | collaborator `indexed` | address | Address of the collaborator |
 | isCollaborator  | bool | A boolean value indicating whether the collaborator has been added (`true`) or removed  (`false`) |
 
+### MetadataURIUpdated
+
+```solidity
+event MetadataURIUpdated(address indexed collection, string attributesMetadataURI)
+```
+
+Used to notify listeners that the metadata URI for a collection has been updated.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| collection `indexed` | address | Address of the collection |
+| attributesMetadataURI  | string | The new attributes metadata URI |
+
 ### StringAttributeUpdated
 
 ```solidity

docs/RMRK/extension/tokenAttributes/RMRKTokenAttributesRepository.md

@@ -192,6 +192,28 @@ Used to retrieve multiple token attributes of any type at once.
 | addressAttributes | address[] | An array of addresses, in the same order as the addressKeys |
 | bytesAttributes | bytes[] | An array of bytes, in the same order as the bytesKeys |
 
+### getAttributesMetadataURI
+
+```solidity
+function getAttributesMetadataURI(address collection) external view returns (string attributesMetadataURI)
+```
+
+Used to retrieve the attributes metadata URI for a collection, which contains all the information about the collection attributes.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| collection | address | Address of the collection |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| attributesMetadataURI | string | The URI of the attributes metadata |
+
 ### getBoolAttribute
 
 ```solidity
@@ -795,6 +817,23 @@ function setAttributes(address collection, uint256 tokenId, IERC7508.StringAttri
 | addressAttributes | IERC7508.AddressAttribute[] | undefined |
 | bytesAttributes | IERC7508.BytesAttribute[] | undefined |
 
+### setAttributesMetadataURI
+
+```solidity
+function setAttributesMetadataURI(address collection, string attributesMetadataURI) external nonpayable
+```
+
+Used to set the metadata URI for a collection, which contains all the information about the collection attributes.
+
+*Emits a {MetadataURIUpdated} event.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| collection | address | Address of the collection |
+| attributesMetadataURI | string | The URI of the attributes metadata |
+
 ### setBoolAttribute
 
 ```solidity
@@ -1082,6 +1121,23 @@ Used to notify listeners that a new collaborator has been added or removed.
 | collaborator `indexed` | address | Address of the collaborator |
 | isCollaborator  | bool | A boolean value indicating whether the collaborator has been added (`true`) or removed  (`false`) |
 
+### MetadataURIUpdated
+
+```solidity
+event MetadataURIUpdated(address indexed collection, string attributesMetadataURI)
+```
+
+Used to notify listeners that the metadata URI for a collection has been updated.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| collection `indexed` | address | Address of the collection |
+| attributesMetadataURI  | string | The new attributes metadata URI |
+
 ### StringAttributeUpdated
 
 ```solidity

test/interfaces.ts

@@ -7,7 +7,7 @@ export const IERC6220 = '0x28bc9ae4'; // Equippable and Composable
 export const IERC6454 = '0x91a6262f'; // Soulbound
 export const IERC7401 = '0x42b0e56f'; // Nestable
 export const IERC7409 = '0x1b3327ab'; // Emotes Repository
-export const IERC7508 = '0x9f89917b'; // Attributes Repository
+export const IERC7508 = '0x62ee8e7a'; // Attributes Repository
 export const IERC7590 = '0x6f87c75c'; // ERC20 Token Holder
 export const IOtherInterface = '0xffffffff';
 export const IRMRKCatalog = '0xd912401f'; // ERC6220