Pillar 1 — Semantic storage

RDF storage in PostgreSQL. Turtle goes in; dictionary-encoded, hexastore-indexed, LIST-partitioned quads come out — addressable from any Postgres client.

Features in this pillar

• Load Turtle from disk — one UDF reads any .ttl file off the server filesystem and ingests it.
• Inline Turtle ingest — same parser, no filesystem dependency.
• Verbose ingest statistics — JSONB report of timing, cache hits, batch counts.
• Per-graph LIST partitions — cheap whole-graph drops, isolated namespaces.
• Named graphs (IRI ↔ id mapping) — symmetric IRI lookup for graph-scoped SPARQL.
• Hexastore + dictionary — three covering indexes (SPO/POS/OSP), interned terms.
• Term types — typed literals, language tags, blank nodes, RDF collections.
• Bulk ingest — prepared INSERT pipeline for large ontologies.
• Shared-memory dictionary cache — cross-backend hot path for repeated IRIs.
• Graph lifecycle UDFs — drop_graph, clear_graph, copy_graph, move_graph as partition-level primitives.

At a glance

-- One-time
CREATE EXTENSION pgrdf;
SELECT pgrdf.add_graph(100);

-- Load
SELECT pgrdf.load_turtle('/fixtures/foaf.ttl', 100);
--  → 631

-- Inspect
SELECT pgrdf.count_quads(100);
SELECT * FROM pgrdf._pgrdf_dictionary
 WHERE term_type = 1 LIMIT 5;

Next — Load Turtle from disk →