Update README.md

README.md

@@ -38,8 +38,9 @@ The dataset is provided in **Parquet format** and includes the following columns
 | Column Name        | Type             | Description                                                                 |
 |--------------------|------------------|-----------------------------------------------------------------------------|
 | `chunk_id`         | `str`            | Unique identifier for each chunk.                                           |
-| `cid`              | `str`            | Internal identifier of the deliberation.                                    |
-| `chunk_number`     | `int`            | Index of the chunk within the same deliberation document.                   |
+| `doc_id`           | `str`            | Document identifier of the deliberation.                                    |
+| `chunk_index`     | `int`             | Index of the chunk within the same deliberation document.                   |
+| `chunk_xxh64`      | `str`            | XXH64 hash of the `chunk_text` value.                                       |
 | `nature`           | `str`            | Type of act (e.g., deliberation, decision...).                              |
 | `status`           | `str`            | Status of the document (e.g., vigueur, vigueur_diff).                       |
 | `nature_delib`     | `str`            | Specific nature of the deliberation.                                        |
@@ -60,10 +61,11 @@ The dataset is provided in **Parquet format** and includes the following columns
 Data was extracted from the [the dedicated **DILA** open data repository](https://echanges.dila.gouv.fr/OPENDATA/CNIL/).  
 The following transformations were applied:
 
-- **Basic fields**: `cid`, `title`, `full_title`, `number`, `date`, `nature`, `status`, `nature_delib`, were taken directly from the source XML file.
+- **Basic fields**: `doc_id` (cid), `title`, `full_title`, `number`, `date`, `nature`, `status`, `nature_delib`, were taken directly from the source XML file.
 - **Generated fields**:
   - `chunk_id`: A unique hash for each text chunk.
-  - `chunk_number`: Indicates the order of a chunk within a same deliberation.
+  - `chunk_index`: is the index of the chunk of a same deliberation document. Each document has an unique `doc_id`.
+  - `chunk_xxh64`: is the xxh64 hash of the `chunk_text` value. It is useful to determine if the `chunk_text` value has changed from a version to another. 
 - **Textual fields**:
   - `text`: Chunk of the main text content.
   - `chunk_text`: Combines `title` and the main `text` body to maximize embedding relevance.