README.md

---
license: cc-by-sa-3.0
task_categories:
- text-generation
- feature-extraction
language:
- en
tags:
- rdf
- knowledge-graph
- semantic-web
- triples
size_categories:
- 1K<n<10K
---

# Schema.org

## Dataset Description

Vocabulary schemas for structured data on the web

**Original Source:** https://schema.org/version/latest/schemaorg-current-https.ttl

### Dataset Summary

This dataset contains RDF triples from Schema.org converted to HuggingFace
dataset format for easy use in machine learning pipelines.

- **Format:** Originally turtle, converted to HuggingFace Dataset
- **Size:** 0.01 GB (extracted)
- **Entities:** ~2K types
- **Triples:** ~15K
- **Original License:**
    CC BY-SA 3.0

### Recommended Use

Ontology understanding, vocabulary learning, small-scale testing

### Notes: Direct download, no extraction needed


## Dataset Format: Lossless RDF Representation

This dataset uses a **standard lossless format** for representing RDF (Resource Description Framework)
data in HuggingFace Datasets. All semantic information from the original RDF knowledge graph is preserved,
enabling perfect round-trip conversion between RDF and HuggingFace formats.

### Schema

Each RDF triple is represented as a row with **6 fields**:

| Field | Type | Description | Example |
|-------|------|-------------|---------|
| `subject` | string | Subject of the triple (URI or blank node) | `"http://schema.org/Person"` |
| `predicate` | string | Predicate URI | `"http://www.w3.org/1999/02/22-rdf-syntax-ns#type"` |
| `object` | string | Object of the triple | `"John Doe"` or `"http://schema.org/Thing"` |
| `object_type` | string | Type of object: `"uri"`, `"literal"`, or `"blank_node"` | `"literal"` |
| `object_datatype` | string | XSD datatype URI (for typed literals) | `"http://www.w3.org/2001/XMLSchema#integer"` |
| `object_language` | string | Language tag (for language-tagged literals) | `"en"` |

### Example: RDF Triple Representation

**Original RDF (Turtle)**:
```turtle
<http://example.org/John> <http://schema.org/name> "John Doe"@en .
```

**HuggingFace Dataset Row**:
```python
{
  "subject": "http://example.org/John",
  "predicate": "http://schema.org/name",
  "object": "John Doe",
  "object_type": "literal",
  "object_datatype": None,
  "object_language": "en"
}
```

### Loading the Dataset

```python
from datasets import load_dataset

# Load the dataset
dataset = load_dataset("CleverThis/schema-org")

# Access the data
data = dataset["data"]

# Iterate over triples
for row in data:
    subject = row["subject"]
    predicate = row["predicate"]
    obj = row["object"]
    obj_type = row["object_type"]

    print(f"Triple: ({subject}, {predicate}, {obj})")
    print(f"  Object type: {obj_type}")
    if row["object_language"]:
        print(f"  Language: {row['object_language']}")
    if row["object_datatype"]:
        print(f"  Datatype: {row['object_datatype']}")
```

### Converting Back to RDF

The dataset can be converted back to any RDF format (Turtle, N-Triples, RDF/XML,
etc.) with **zero information loss**:

```python
from datasets import load_dataset
from rdflib import Graph, URIRef, Literal, BNode

def convert_to_rdf(dataset_name, output_file="output.ttl", split="data"):
    """Convert HuggingFace dataset back to RDF Turtle format."""
    # Load dataset
    dataset = load_dataset(dataset_name)

    # Create RDF graph
    graph = Graph()

    # Convert each row to RDF triple
    for row in dataset[split]:
        # Subject
        if row["subject"].startswith("_:"):
            subject = BNode(row["subject"][2:])
        else:
            subject = URIRef(row["subject"])

        # Predicate (always URI)
        predicate = URIRef(row["predicate"])

        # Object (depends on object_type)
        if row["object_type"] == "uri":
            obj = URIRef(row["object"])
        elif row["object_type"] == "blank_node":
            obj = BNode(row["object"][2:])
        elif row["object_type"] == "literal":
            if row["object_datatype"]:
                obj = Literal(row["object"], datatype=URIRef(row["object_datatype"]))
            elif row["object_language"]:
                obj = Literal(row["object"], lang=row["object_language"])
            else:
                obj = Literal(row["object"])

        graph.add((subject, predicate, obj))

    # Serialize to Turtle (or any RDF format)
    graph.serialize(output_file, format="turtle")
    print(f"Exported {len(graph)} triples to {output_file}")
    return graph

# Usage
graph = convert_to_rdf("CleverThis/schema-org", "reconstructed.ttl")
```

### Information Preservation Guarantee

This format preserves **100% of RDF information**:

- ✅ **URIs**: Exact string representation preserved
- ✅ **Literals**: Full text content preserved
- ✅ **Datatypes**: XSD and custom datatypes preserved
    (e.g., `xsd:integer`, `xsd:dateTime`)
- ✅ **Language Tags**: BCP 47 language tags preserved (e.g., `@en`, `@fr`, `@ja`)
- ✅ **Blank Nodes**: Node structure preserved (identifiers may change but
    graph isomorphism maintained)

**Round-trip guarantee**: Original RDF → HuggingFace → Reconstructed RDF
produces **semantically identical** graphs.

### Querying the Dataset

You can filter and query the dataset like any HuggingFace dataset:

```python
from datasets import load_dataset

dataset = load_dataset("CleverThis/schema-org")

# Find all triples with English literals
english_literals = dataset["data"].filter(
    lambda x: x["object_type"] == "literal" and x["object_language"] == "en"
)
print(f"Found {len(english_literals)} English literals")

# Find all rdf:type statements
type_statements = dataset["data"].filter(
    lambda x: "rdf-syntax-ns#type" in x["predicate"]
)
print(f"Found {len(type_statements)} type statements")

# Convert to Pandas for analysis
import pandas as pd
df = dataset["data"].to_pandas()

# Analyze predicate distribution
print(df["predicate"].value_counts())
```

### Dataset Format

The dataset contains all triples in a single **data** split, suitable for
machine learning tasks such as:

- Knowledge graph completion
- Link prediction
- Entity embedding
- Relation extraction
- Graph neural networks

### Format Specification

For complete technical documentation of the RDF-to-HuggingFace format, see:

📖 [RDF to HuggingFace Format Specification](https://github.com/CleverThis/cleverernie/blob/master/docs/rdf_huggingface_format_specification.md)

The specification includes:
- Detailed schema definition
- All RDF node type mappings
- Performance benchmarks
- Edge cases and limitations
- Complete code examples

### Conversion Metadata

- **Source Format**: turtle
- **Original Size**: 0.01 GB
- **Conversion Tool**: [CleverErnie RDF Pipeline](https://github.com/CleverThis/cleverernie)
- **Format Version**: 1.0
- **Conversion Date**: 2025-12-29


## Citation

If you use this dataset, please cite the original source:

**Original Dataset:** Schema.org
**URL:** https://schema.org/version/latest/schemaorg-current-https.ttl
**License:** CC BY-SA 3.0

## Dataset Preparation

This dataset was prepared using the CleverErnie GISM framework:

```bash
# Download original dataset
python scripts/rdf_dataset_downloader.py schema-org -o datasets/

# Convert to HuggingFace format
python scripts/convert_rdf_to_hf_dataset_unified.py \
    datasets/schema-org/[file] \
    hf_datasets/schema-org \
    --format turtle \
    --strategy auto

# Upload to HuggingFace Hub
python scripts/upload_all_datasets.py --dataset schema-org
```

## Additional Information

### Original Source

https://schema.org/version/latest/schemaorg-current-https.ttl

### Conversion Details

- Converted using: [CleverErnie GISM](https://github.com/cleverthis/cleverernie)
- Conversion script: `scripts/convert_rdf_to_hf_dataset_unified.py`
- Dataset format: Single 'data' split with all triples
- Strategy: Auto-selected based on dataset size and format

### Maintenance

This dataset is maintained by the CleverThis organization.