libgraph

libgraph——基于 N3 库的 RDF 图索引。GraphIndex 负责存储与查询关联数据三元组；PREFIXES 提供了标准命名空间（schema、rdf、rdfs、foaf）；parseTripleQuery 能解析主语-谓语-宾语模式；serializeShacl 则可生成 SHACL 约束。该库适用于知识图谱构建、语义查询以及关联数据的处理与分析。

name: libgraph description: > libgraph - RDF graph index using N3 library. GraphIndex stores and queries linked data triples. PREFIXES provides standard namespaces (schema, rdf, rdfs, foaf). parseTripleQuery parses subject-predicate-object patterns. serializeShacl generates SHACL constraints. Use for knowledge graphs, semantic queries, and linked data processing.

libgraph Skill

When to Use

•Building and querying knowledge graphs
•Storing RDF triples for semantic data
•Executing subject-predicate-object pattern queries
•Working with linked data and ontologies

Key Concepts

GraphIndex: Storage-backed index for RDF triples with pattern-based querying.

PREFIXES: Standard namespace prefixes for common vocabularies (schema.org, RDF, RDFS, FOAF).

Triple patterns: Query graphs using subject-predicate-object patterns with wildcards.

Usage Patterns

Pattern 1: Query graph triples

javascript

import { createGraphIndex, PREFIXES } from "@copilot-ld/libgraph";

const index = await createGraphIndex(storage, "knowledge");
const results = await index.query(
  `${PREFIXES.schema}Person`,
  `${PREFIXES.schema}name`,
  "?",
);

Pattern 2: Parse triple query string

javascript

import { parseTripleQuery } from "@copilot-ld/libgraph";

const { subject, predicate, object } = parseTripleQuery("schema:Person ? ?");

Integration

Used by Graph service for knowledge queries. Processes ontology.ttl files.