Put an RDF graph in one file. Drop it on a URL. Query it with SPARQL — no database server.

▶ Try it in your browser · JS lab (D3) · Historical atlas · Docs

The name comes from Latin rēte, meaning "net". Pronounce it RAY-teh (Classical Latin: roughly /ˈreː.te/).

rete packs a whole RDF graph — its dictionary, permutation indexes, a community summary, and a self-describing schema pyramid — into one immutable .rete file. Put that file on S3, GitHub Pages, or any HTTP host that supports range requests, hand a client the URL, and it runs real SPARQL against the file in place, fetching only the bytes a query needs. The same engine compiles to WebAssembly, so a browser can query the file directly with no backend.

Think Parquet (for tables) or PMTiles (for maps) — but for RDF graphs + SPARQL.

• No server. The file is the database. Publish once to static hosting.
• Query in place. SELECT / ASK / CONSTRUCT / DESCRIBE, joins, OPTIONAL, UNION, MINUS, FILTER, subqueries, property paths, GROUP BY / aggregates, XSD casts and the SPARQL 1.1 function library, named graphs, and GeoSPARQL (geometry + time) — ~75% of the W3C query-evaluation suite (309 tests; ≈89% excluding the RDFS/OWL-entailment regime rete leaves out by design and the SERVICE tests, which need a live endpoint — SERVICE federation itself is supported).
• Lazy over HTTP — and on disk. Range-read the file wherever it lives: a selective query faults in only the dictionary chunks and index tiles it touches, so a 1 GB graph stays interactive in the browser and a 52 GB graph opens locally in KBs (files past 1 GiB go through the same range reader).
• Bounded memory at any scale. Aggregation streams through per-group accumulators — a COUNT over the 9.83-billion-triple DataCite file returns 779,399 in 4 s inside a 2 GiB container, and a GROUP BY over its 1.38 B-row type slice fits in 4 GiB (benchmark).
• Self-describing. Every file can carry its own Dataset Card (counts, vocabulary, detected signals, and a library of ready-to-run starter queries) plus a schema pyramid — a leveled rdf:type legend you read index-free in a couple of range requests. See below.
• Small + fast to open. Compressed (zstd) with indexes prebuilt, so it opens in ~20 ms — no load/index step. (See benchmarks.)
• Runs in the browser. Same engine in WASM — the interactive playground is a single offline HTML page.

One engine, every runtime — every client opens local files and remote URLs through the same lazy range reader and returns parsed SPARQL results (all client versions track the engine's 0.3.x line):

Client	Get it	Notes
Python	pip install rete-graph	CPython ≥ 3.9 wheels for Linux/macOS/Windows plus Pyodide (JupyterLite, marimo WASM) · docs · tutorial
JavaScript	npm install rete-graph — or one <script> tag: cdn.jsdelivr.net/npm/rete-graph@0.3.0/dist/rete-graph.min.js	Node ≥ 18 + browsers; TypeScript types included · docs
Rust	cargo install rete-cli --locked, or rete-core as a library	native + wasm · Rust API · CLI reference · docs.rs
Java	mvn -f clients/java install — not published to Maven Central yet, so there is no coordinate to depend on	pure JVM — the engine as wasm on Chicory, plus an RDF4J Sail binding · readme
R	remotes::install_github("caviri/rete", subdir = "clients/r", build = FALSE) (needs Rust) — not on CRAN or R-universe	R ≥ 4.2; SPARQL results as data frames · docs
Browser, zero install	playground · SPARQL IDE	query any .rete URL with no install at all
Claude Desktop	⬇ rete.mcpb — double-click it (or take the checksummed copy from Releases)	one-click MCP Bundle: the engine runs locally, so your own graphs stay on your machine and work offline · docs
Blender	add-on zip from Releases	SPARQL results as 3D scenes; bundles the Python wheels · docs
Hosted gateway	katospiegel-rete.hf.space	no install: /mcp (agent tools), REST /api, and a W3C SPARQL 1.1 endpoint per dataset at /sparql/{dataset}

This repo doubles as a Claude Code plugin marketplace. Two commands wire everything into Claude — the build/publish skills and the rete MCP server (SPARQL + SHACL over 65 public knowledge graphs, entity search, dataset cards, media previews):

/plugin marketplace add caviri/rete
/plugin install rete-graph@rete

After install: ask Claude to query any dataset ("how many Spanish laws cite the Constitution?"), validate shapes, preview IIIF/PDF media, or build a .rete from your own data with /rete-graph:rete-from-graph. The same MCP server also plugs into ChatGPT (developer mode or as a connector) and any other MCP client — see the agentic interfaces guide.

Open a .rete you've never seen and the cold-start problem bites: which classes exist, how do they connect, where do you even start? rete fixes this by shipping the answer inside the file, read over a couple of HTTP range requests without ever touching the triple index:

• The Dataset Card (rete card-url <url>) — title/license, term and class counts, the vocabulary, detected affordances (label / time / geo predicates, spatial bbox, …), and an auto-generated, runnable starter-query library.
• The schema pyramid (rete summary --level k) — a leveled rdf:type histogram where abstract classes describe the coarse view and leaf classes resolve as you zoom in. It also keeps the lateral relations between classes (not just the is-a tree), as a non-exclusive graph.

$ rete summary big.rete --level 0     # the big picture, index-free
   12048  <http://schema.org/Person>
    3017  <http://schema.org/Organization>
$ rete summary big.rete --level 2     # zoom in — leaves resolve
    4102  <http://schema.org/Scientist>  …

Full guide: Semantic zoom (schema pyramid).

✅ A good fit when…

• You want to publish a graph dataset and let people query it without standing up (and paying for) a triplestore — just static hosting + a URL.
• The data is read-mostly / versioned snapshots (a release, a daily dump, a knowledge-base export) rather than constantly mutated.
• You need SPARQL in the browser / at the edge / in a notebook, with no backend.
• You ship many graphs (per-tenant, per-dataset, sharded by year) and want each to be one cheap, cacheable, queryable artifact — even federated across several files (UNION federation: per-source results merged; cross-file joins are not resolved).
• You care about bounded, progressive reads — fetch a coarse overview first, drill into detail only where a query needs it (PMTiles-style, for graphs).

🚫 Reach for a real triplestore instead when…

• You need frequent writes / transactions / live updates (rete files are immutable — you rebuild to change them).
• You need an always-on SPARQL endpoint with a mature, battle-tested planner (e.g. Oxigraph, Jena, GraphDB). rete's engine wins or ties most benchmark shapes against Oxigraph, but it is optimized for publish-and-query, not server throughput — see the honest comparison.
• You need full OWL/RDFS entailment at query time — rete bakes a fixed set of RDFS/OWL-RL inferences at build (rete build --materialize) rather than entailing during evaluation.

You do not need Rust, a clone of this repo, or its dev container to use rete. A prebuilt CLI image is published — ghcr.io/caviri/rete-cli, ~30 MB on distroless, multi-arch (amd64 + arm64) — so RDF dump → .rete is one command:

# run this in the directory that holds your dump
docker run --rm -v "$PWD:/data" ghcr.io/caviri/rete-cli:latest \
  build /data/dump.nt -o /data/out.rete --card --title "My graph"

embedded dataset card (16240 bytes of metadata)
wrote /data/out.rete: 5 triples, 8 terms, 1 pyramid level(s), 18061 bytes

-v "$PWD:/data" maps the current directory onto /data inside the container, so /data/out.rete is ./out.rete on your machine: the file is sitting next to your dump when the command exits, with nothing to copy out of a container. --card embeds the Dataset Card — counts, vocabulary, and runnable starter queries — and is optional.

Inspect and query it with the same image. One alias keeps the rest readable (-w /data makes the container's working directory your directory, so plain filenames work):

alias rete='docker run --rm -i -v "$PWD:/data" -w /data ghcr.io/caviri/rete-cli:latest'

rete stats   out.rete    # size, counts, top predicates, planner stats, entity shapes
rete card    out.rete    # the self-description: vocabulary, signals, starter queries
rete summary out.rete --level 0   # the schema pyramid, most abstract level
rete sparql  out.rete 'SELECT ?s ?name WHERE { ?s <http://xmlns.com/foaf/0.1/name> ?name }'
rete why     out.rete --predicate '<http://ex/knows>'   # explain result provenance

Variants worth knowing:

# Turtle, N-Quads and RDF/XML (.rdf / .owl — how most OWL ontologies ship) are
# detected by extension; --format nt|nq|ttl|rdfxml overrides detection.
rete build ontology.owl -o ontology.rete

# Several inputs merge into one file under a shared dictionary.
rete build part1.nt part2.nt -o merged.rete

# `-` reads stdin, so a dump never has to touch your disk (defaults to N-Triples).
curl -sL https://host/dump.nt | rete build - -o out.rete

Three container gotchas, all of them silent. Piping needs docker run -i — the alias above sets it, but without -i stdin is empty and build - writes a valid, 0-triple file and exits 0. On Linux the image runs as root, so add --user "$(id -u):$(id -g)" unless you want output owned by root. On Windows Git Bash, MSYS rewrites both the mount and /data/… arguments (/data/dump.nt becomes C:/Program Files/Git/data/dump.nt, and a $PWD mount resolves to a directory that is not yours — the build reports success and no file appears); use MSYS_NO_PATHCONV=1 docker run --rm -v "$(pwd -W):/data" ….

A graph that already lives on a URL needs no download, and no mount either if you point the bare image at it — these are the range-read commands, fetching only the bytes an answer needs:

docker run --rm ghcr.io/caviri/rete-cli:latest \
  card-url https://data.graphplaza.com/opencitations/opencitations.rete
# fetched 2764 of 35852509508 bytes in 3 range request(s) — index NOT fetched
#   title   : OpenCitations Meta
#   triples : 5178674356

rete query-url  https://my-bucket.s3.amazonaws.com/social.rete --object '<http://ex/Alice>'
rete sparql-url https://my-bucket.s3.amazonaws.com/social.rete 'SELECT * WHERE { ?s ?p ?o } LIMIT 5'

query-url resolves bound terms from the dictionary, then range-fetches only the best-matching permutation payload for that triple pattern; sparql-url faults in index tiles as a query touches them. rete cost --explain shows when a query can use the summary-only or routed-pattern budgets.

Prefer not to go through Docker at all? The same engine ships as pip install rete-graph and npm install rete-graph (see Clients), which build and query files from Python and JavaScript directly. The other two published images — the full toolchain and the HTTP/MCP relay — are documented in docker/README.md.

The playground is a self-contained offline page bundling the WASM engine and 65 example datasets — from tiny embedded graphs to remote, lazily-queried ones served over HTTP range requests:

• a real 588k-triple OpenCitations citation network,
• the getty-ulan artist-mentorship lineage (~205k triples, remote),
• the entire 98 MB OpenHistoricalMap planet (~6.1M dated, geolocated features), and
• a 104 MB and a 1 GB slice of Wikidata — queried in the browser without downloading them.

Pick a dataset, run filterable SPARQL examples, inspect progressive exactness metadata, validate SHACL, explore reachability, render schema summaries, and explain triple-pattern provenance — all offline. Two focused demos:

• JS lab — query a .rete from JavaScript and wire the results straight into a D3 force graph, in one page.
• Historical atlas — GeoSPARQL + time over a .rete, with 80+ map overlays (battles, castles, treaties, …).

Every shot below is the same single HTML page, querying a file that stays on its URL. Each links to the deep link that reproduces it.

SPARQL against 5.18 billion triples, from a browser tab. opencitations.rete is one 33.4 GB file on object storage. The line under the toolbar is the whole point: 25 rows came back after 161 range requests and 189 MB — including opening the file. The other 33 GB were never transferred, and there is no server on the other end.

The pictures are in the graph. Those photographs are xsd:base64Binary WebP literals stored inside the .rete, rendered straight into the result cell — no image host, no second request, nothing to rot. Forty rows and their pictures cost one range request and 256 KB of a 9.8 MB file. The same renderers handle IIIF manifests, PDFs, audio, video and .glb 3D models.

The file describes itself. Every .rete can carry a Dataset Card — licence, counts, vocabularies, classes, and runnable starter queries. Read straight off the header: 58.5 KB in one coalesced range request, without touching the triple index, on a 5 M-triple file or a 5 B-triple one alike.

GeoSPARQL, drawn. 3,000 raptor sightings selected out of a 334 M-triple, 1.43 GB GBIF graph and put on a basemap — geo:asWKT literals detected in the result and rendered as a map view. This run answers entirely from the session's 86 MB block cache, which is what makes panning around a remote graph feel local.

Browse it like an archive, without writing SPARQL. Explore turns each rdf:type class into a table — entities as rows, their properties as columns — so an unfamiliar graph is navigable before you know a single predicate in it.

Real OpenCitations citation network (539,246 sanitized triples from the ~588k-triple playground dataset), vs Oxigraph (in-memory), in the dev container — full writeup in Benchmarks:

rete opens ~120× faster, and after the 2026 engine rework (lazy slot-row pipeline, adaptive index-nested-loop joins, top-k ORDER BY) it wins or ties most SPARQL shapes — aggregates, GROUP BY, DISTINCT, OPTIONAL, UNION/VALUES, paths, sorted pagination. Oxigraph keeps a fractional edge on ASK, the tightest LIMIT joins, and non-literal REGEX scans. File size: ~6.4× smaller than raw N-Triples, ~2.3× of gzip — but queryable.

And it holds at scale: the 52 GB, 9.83-billion-triple DataCite file answers a COUNT in 4 s inside a 2 GiB container and a GROUP BY over 1.38 B rows in 131 s inside 4 GiB — aggregation streams, memory is O(groups) (full numbers).

Honest note on the pyramid. Two structures ship in the file: the community summary scales with the graph and helps overview/aggregate queries but adds build time and gives node-selective queries no benefit (use --no-pyramid to drop it); the schema pyramid is bounded by the ontology and stays cheap at any scale. See the cost-vs-benefit benchmark.

A 1 KB header — a small fixed core plus a typed section directory — points at every section, so a client reads only what it needs (and new sections are just new directory entries).

The anatomy on a real specimen (dblp.rete, 179 M triples) — in the spirit of the classic Parquet file-layout figure.

See the format spec and architecture for the details.

• Graph data 101 — new to RDF/graphs? Start here.
• Getting started · Architecture · CLI reference · SPARQL support · GeoSPARQL · SHACL validation
• Dataset Cards · Semantic zoom (schema pyramid) · Reasoning & coherence · Federated queries
• Interactive playground · JS lab (D3) · Historical atlas
• Run the notebooks: JupyterLite (in your browser, no account) · Colab · Binder
• Format spec · Benchmarks · SPARQL conformance · Browser / WASM

The docs render as Markdown on GitHub, or as an HTML site (docs/*.html, regenerated with cargo run -p docgen).

v0.3.2 — the 0.3.x engine line, shipped to crates.io (rete-core, rete-cli, rete-wasm, rete-graph), PyPI and npm with every client in lockstep (see CHANGELOG). The Java client and the R package are built from this repo and are not on Maven Central or CRAN. Working end-to-end — the single-file format, dictionary + permutation indexes, the community summary and a self-describing schema pyramid, SPARQL + GeoSPARQL, lazy HTTP-range queries (with per-tile synopses that prune a routed tile before fetching it), and the browser/WASM engine. Stable file-format generation 1 (header byte 0x05, frozen 2026-07-14 and first released in 0.3.0) has not moved since that freeze — but "stable" names the generation and is not a compatibility promise: no backwards-compatibility guarantee is made before 1.0.0, and the format may still change in ways that require rebuilding a file you already published. The experimental generations 0x01–0x04 predate that freeze and must be rebuilt from RDF source. The generation number is not the release version — there is no Rete 1.0.0, and the Rust, CLI, and WASM APIs carry no semver promise until there is. SPARQL evaluation is exact for supported shapes (no implicit OWL/RDFS query-time entailment); cross-file federation is UNION-fan-out, while SPARQL 1.1 SERVICE calls external endpoints from inside a query.

This section is about building the project, not using it — if you only want to turn a dump into a .rete, the quick start above needs none of it. Everything here runs through the checked-in Docker Compose/devcontainer toolchain, so nothing builds on your host:

# The canonical image, then the CLI in the shared target volume (target/release/rete):
docker compose build dev
docker compose run --rm dev cargo build --release -p rete-cli

docker compose run --rm dev cargo test --workspace --exclude rete-bench
docker compose run --rm dev cargo run -p rete-cli -- info some.rete
docker compose run --rm dev bash scripts/smoke.sh
docker compose run --rm dev uv run python scripts/build_playground.py
docker compose run --rm gate                   # full Playwright regression gate
docker compose run --rm gate-catalog           # every embedded catalog query
docker compose run --rm gate-catalog-live      # every catalog query (slow, live R2)
docker compose run --rm gate-firefox           # regular gate in Firefox

Open the repository in its devcontainer for an interactive shell backed by the same dev service. check, wasm, wasm-async, docs, and the gate* services are named Compose services used by local development and release verification.

CI runs fmt, clippy, the test matrix, the CLI smoke test, a query-engine regression check (qbench --check: per-query row counts + time ceilings), and the WASM build in containers, so nothing builds on the host. See Getting started for the dev-container setup.

rete is free and open source. If it's useful to you, you can support its development on Ko-fi:

Apache-2.0.