Update README.md

README.md

@@ -50,4 +50,29 @@ configs:
     path: data/validation-*
   - split: test
     path: data/test-*
+license: cc
+language:
+- la
 ---
+
+# Aggregated Universal Dependencies for Latin
+
+Based on the Github r2.15 release of all Latin corpora, namely UDante, PROIEL, Perseus, LLCT, ITTB and CIRCSE. Parsed with [`conllu`](https://github.com/EmilStenstrom/conllu).
+
+To ensure compatibility with Hugging Face datasets and the underlying Arrow format, some quirks are present in the dataset:
+
+- the ID field (`token_ids`) is a string rather than an integer. This is needed because in rare cases the ID can be a token range like `1-2`.
+- because features can contain arbitrary content that is only semi-structured (not consistent across tokens), it is dumped as a JSON string for each token. So the `token_feats` field is a list of strings where each string should be JSON-decoded before use.
+- the same is true for `token_miscs`
+- and also for `sent_metadata` which contains the sentence metadata apart from the text and ID
+
+## License
+
+Note that not all corpora have the same license. Only use those that you can comply with and filter as necessary on the `corpus` field:
+
+- "UDante": "cc-by-sa-4.0"
+- "Perseus": "cc-by-nc-sa-2.5"
+- "PROIEL": "cc-by-nc-sa-4.0"
+- "LLCT": "cc-by-sa-4.0"
+- "ITTB": "cc-by-nc-sa-3.0"
+- "CIRCSE": "cc-by-sa-4.0"