description updated

README.md

@@ -6,4 +6,45 @@ tags:
 - ontology
 - knowledge-graphs
 - embeddings
----
+---
+
+# Ontology & Embedding Database
+
+This repository provides the **local ontology database** to be used by StructSense (in general can be used for any other purpose), including both structured ontological data and precomputed vector embeddings for efficient semantic search.
+
+## Overview
+
+- **3,925,124 classes**
+- **2,683,756 synonyms**
+- Data storage:
+  - **SQLite** → structured ontology data  
+  - **ChromaDB** → vector embeddings for semantic retrieval
+
+
+Vector embeddings (includes label + synonyms + alternative labels + definition) are generated using the `BAAI/bge-large-en-v1.5` model to enable high-quality semantic similarity search.
+
+
+## Database Schema (Main Tables)
+
+If you plan to extend or enrich the database, the primary tables include:
+
+- `ontologies`
+- `classes`
+- `synonyms`
+- `labels`
+- `parents`
+ 
+
+## 🔎 Search & Query
+
+You can explore the ontology, perform semantic search, and run database queries via the Hugging Face Space:
+
+👉 https://huggingface.co/spaces/sensein/demo-ontology-search
+
+
+## Data Source
+
+The original ontology data is sourced from **BioPortal**, which aggregates biomedical ontologies from multiple authoritative providers.
+
+ 
+