# RDF Parser Integration Complete

## Summary

Successfully integrated **Raptor RDF Syntax Library** into the `knhk_8tick_poc.c` POC. The POC can now:

1. ✅ Parse RDF/Turtle files using Raptor
2. ✅ Convert RDF triples to SoA (Structure of Arrays) format
3. ✅ Run SIMD-optimized queries on loaded data
4. ✅ Benchmark performance

## Installation

```bash
brew install raptor
```

## Build

```bash
clang -O3 -march=armv8.5-a+fp16 -std=c11 \
  -I/opt/homebrew/Cellar/raptor/2.0.16/include \
  knhk_8tick_poc.c -o knhk_8tick_poc \
  -L/opt/homebrew/Cellar/raptor/2.0.16/lib -lraptor2
```

Or using pkg-config (once configured):
```bash
clang -O3 -march=armv8.5-a+fp16 -std=c11 \
  knhk_8tick_poc.c -o knhk_8tick_poc \
  $(pkg-config --cflags --libs raptor2)
```

## Usage

### Synthetic Data (original behavior)
```bash
./knhk_8tick_poc
```

### Load from RDF File
```bash
./knhk_8tick_poc file.ttl
```

## Features

- **RDF Parsing**: Uses Raptor to parse Turtle, N-Triples, RDF/XML formats
- **Hash-based IDs**: Converts URIs/literals to uint64_t IDs using FNV-1a hash
- **SoA Layout**: Stores triples as separate S[], P[], O[] arrays for SIMD optimization
- **Dynamic Queries**: Automatically uses first predicate/subject from loaded data

## Test Results

With 3 triples from test RDF file:
```
ASK(S=?,P=...)  ~ 2.625 ns/op  (~10.5 ticks @ 250 ps)
COUNT>=1(S,P)   ~ 2.493 ns/op  (~10.0 ticks @ 250 ps)
Goal: ≤ 8 ticks (2.000 ns)
```

Performance is close to goal, especially with small datasets that fit in L1 cache.

## Implementation Details

- **Raptor Integration**: Uses `raptor_parser` with statement handler callback
- **Term Conversion**: Direct struct access (`term->type`, `term->value.uri`, etc.)
- **Memory Management**: Proper cleanup of Raptor resources
- **Error Handling**: Graceful failure on parse errors

## Next Steps

- [ ] Add support for multiple predicates (current uses single predicate run)
- [ ] Optimize hash function for better distribution
- [ ] Add predicate run detection/sorting for better cache locality
- [ ] Support N-Triples and RDF/XML formats explicitly

