OxiVault

Vault-LD knowledge graph store on object storage.

oxivault converts Obsidian-style Markdown vaults to and from RDF using in-process Vault-LD reference algorithms and RDFLib. It supports local files, in-memory stores, Git repositories, and S3-compatible object storage, with CLI, Python, and HTTP API interfaces.

Upstream specification and reference credit

OxiVault builds on the original Vault-LD work from The Knowledge Graph Guys:

• Specification: Vault-LD SPEC.md
• Reference implementation:
  • scripts/vault_to_rdf.py
  • scripts/rdf_to_vault.py

This project adapts those reference conversion algorithms for in-process library use under src/oxivault/_reference/vault_ld/.

Features

• Vault ↔ RDF conversion
  • vault2rdf: export vault content to schema.ttl and data.ttl
  • rdf2vault: ingest RDF into Markdown notes with frontmatter
• Graph access and querying
  • Canonical triples table via Vault.triples() (Polars DataFrame)
  • SPARQL querying via Vault.query() and oxivault query
  • Graph exploration via neighbors(), backlinks(), search(), search_body()
• Note CRUD with optimistic concurrency
  • get_note(), put_note(), delete_note(), list_notes(), exists_note()
• ObjectStore backends
  • LocalDirStore, MemoryStore, S3Store, GitStore
• Sync engine
  • Two-way sync between local vaults and S3-compatible storage (oxivault sync)
• HTTP API server (FastAPI)
  • Endpoints for notes, graph querying, search, and reindexing

Requirements

• Python 3.14+
• For S3 sync/backends: credentials configured for your AWS or S3-compatible provider (through boto3/client configuration)

Installation

pip install oxivault

With uv:

uv add oxivault

CLI quick start

Export a vault to RDF:

oxivault vault2rdf ./my-vault --out-dir ./dist --source

Ingest RDF into a vault:

oxivault rdf2vault ./my-vault ./graph.ttl

Run a SPARQL query:

oxivault query ./my-vault "SELECT ?s ?p ?o WHERE { ?s ?p ?o } LIMIT 10"

Sync local vault with S3:

oxivault sync ./my-vault --bucket my-s3-vault --direction both

Start the HTTP API server:

oxivault serve ./my-vault --host 127.0.0.1 --port 8000

Python quick start

from oxivault.models import RdfDocument
from oxivault.store.memory import MemoryStore
from oxivault.vault import Vault

store = MemoryStore()
vault = Vault(store)

rdf = b"""@prefix ex: <https://example.org/> .
@prefix data: <https://example.org/data/> .

data:item1 a ex:Thing .
"""

vault.rdf2vault([RdfDocument(content=rdf, format="turtle")])

triples = vault.triples()
print(triples.select(["subject", "predicate", "object"]))

HTTP API

Run:

oxivault serve ./my-vault --port 8000

Then use:

• GET /vault
• GET /notes
• GET /notes/{path}
• PUT /notes/{path}
• DELETE /notes/{path}
• POST /graph/sparql
• GET /graph/edges?subject=...
• GET /graph/issues
• GET /search?q=...
• POST /reindex

Interactive docs are available at /docs.

Conversion behavior and constraints

• Not all RDF graphs are representable as vault notes. Check reported conversion issues when ingesting/exporting.
• CLI RDF ingest accepts .ttl (Turtle) and .nt (N-Triples) files.
• Vault.vault2rdf() and oxivault vault2rdf default to query-oriented export. Use source=True (Python) or --source (CLI) to include placement metadata for roundtrip location fidelity.
• Vault.rdf2vault([]) is invalid (empty sequence). Passing a non-empty sequence with an empty RDF document is valid.

Examples

Runnable examples are in examples/:

• examples/local_store_demo.py
• examples/roundtrip_demo.py
• examples/graph_query_demo.py
• examples/server_and_backends_demo.py

Run an example:

uv run python examples/roundtrip_demo.py

Development

uv sync --group dev
tara check

Release and PyPI publishing

Publishing is automated with GitHub tags through .github/workflows/publish.yml. Create and push an annotated SemVer tag to publish, for example:

git tag -a v0.1.0 -m "Release 0.1.0"
git push origin v0.1.0

The publish workflow builds source and wheel distributions and uploads them to PyPI with GitHub OIDC trusted publishing. Configure a PyPI trusted publisher for dkapitan/oxivault that points to workflow publish.yml and environment pypi.

License

Licensed under the Apache License 2.0. See LICENSE.

Project links

• Source: https://github.com/dkapitan/oxivault
• Issue tracker: https://github.com/dkapitan/oxivault/issues
• Changelog: CHANGELOG.md