Update README: add training as primary use case

README.md

@@ -5,17 +5,42 @@ tags:
   - formal-methods
   - isabelle
   - hol
+task_categories:
+  - text-generation
+  - feature-extraction
+language:
+  - en
 size_categories:
   - 10K<n<100K
 ---
 
 # Isabelle-Stdlib
 
-Isabelle/HOL standard library and core theories (78,022 entries).
+Structured dataset from the **Isabelle/HOL standard library** - core theories and analysis.
+
+**78,022 declarations** extracted from Isabelle theory files.
+
+Includes HOL, HOL-Library, HOL-Analysis, and other foundational Isabelle theories.
+
+## Applications
+
+- Training language models on formal proofs
+- Fine-tuning theorem provers
+- Retrieval-augmented generation for proof assistants
+- Learning proof embeddings and representations
 
 ## Source
 
-- **Repository:** https://github.com/seL4/isabelle
+- **Repository:** https://isabelle.in.tum.de/
 - **License:** BSD-3-Clause
 
-Includes HOL, HOL-Library, HOL-Analysis, and other core Isabelle theories.
+## Schema
+
+| Column | Type | Description |
+|--------|------|-------------|
+| fact | string | Declaration body |
+| type | string | theorem, lemma, definition, etc. |
+| library | string | Source module |
+| imports | list | Required imports |
+| filename | string | Source file path |
+| symbolic_name | string | Identifier |