Apache Jena

Apache Jena is a Java framework for building Semantic Web and Linked Data applications. It provides APIs for RDF, SPARQL, OWL, and a triplestore database (TDB2) along with the Fuseki SPARQL server with a REST API for querying and managing RDF datasets.

Apache Jena publishes 5 API contracts indexed on the APIs.io network, including Dataset Management API, Graph Store Protocol API, SPARQL Query API, and 2 more. Tagged areas include Java, Linked Data, OWL, Ontology, and Open Source.

The Apache Jena catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Apache Jena’s developer surface includes documentation, getting-started guide, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.0/100 thin ▬ flat Agent 22/100 agent aware open core · Apache-2.0 Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 published contract 7 Features 4 Use Cases

Java Linked Data OWL Ontology Open Source RDF Semantic Web SPARQL

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 38.0/100 · thin

Contract Quality 8.1 / 16

Developer Ergonomics 2.8 / 13

Access Clarity 2.2 / 13

Operational Transparency 3.0 / 8

Contract Governance 2.1 / 8

Discoverability 3.7 / 7

Regulatory Posture 3.1 / 15

Open Source Surface 7.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 17.0 — up to +16.6 composite points Ask about this →
Developer Ergonomics scores 21.4 — up to +15.7 composite points Ask about this →
Contract Quality scores 49.7 — up to +12.6 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/apache-jena/apis.yml: open an issue on github.com/api-evangelist/apache-jena to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

RDF

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Apache Jena Java API

The Jena Java API provides programmatic access to RDF model creation, SPARQL query execution, OWL reasoning, and TDB2 triplestore management for building Semantic Web applications.

Apache Jena Dataset Management API

Dataset administration

Apache Jena Graph Store Protocol API

SPARQL Graph Store HTTP Protocol operations

Apache Jena SPARQL Query API

SPARQL 1.1 Query operations

Apache Jena SPARQL Update API

SPARQL 1.1 Update operations

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Apache Jena Fuseki SPARQL Dataset Management API

OPEN COLLECTION

Apache Jena Fuseki SPARQL Dataset Management Graph Store Protocol API

OPEN COLLECTION

Apache Jena Fuseki SPARQL Dataset Management SPARQL Query API

OPEN COLLECTION

Apache Jena Fuseki SPARQL Dataset Management SPARQL Update API

OPEN COLLECTION

Apache Jena API pricing

Not yet checked against Apache Jena's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Apache Jena's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Apache Jena Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apache Jena Rate Limits

5 limits

RATE LIMITS

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Apache Jena

1 quoted statement, read from Apache Jena's own page on 2026-11-09.

LICENSE

FinOps 1

Cost, billing, and metering signals for API financial operations.

Apache Jena Finops

FINOPS

Features 7

Notable capabilities this provider offers.

SPARQL Query and Update

Full SPARQL 1.1 query and update protocol support via Fuseki REST API.

RDF Model API

Java API for creating, reading, and manipulating RDF graphs.

OWL Reasoning

OWL and RDFS inference via Jena's rule-based and OWL reasoners.

TDB2 Triplestore

Native high-performance RDF triplestore for persistent graph storage.

Graph Store Protocol

SPARQL Graph Store HTTP Protocol for named graph management.

Multiple RDF Formats

Support for Turtle, JSON-LD, N-Triples, RDF/XML, and TriG serialization.

Ontology API

High-level API for working with OWL and RDFS ontologies.

Scroll for all 7

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Apache Jena Fuseki Sparql Api Context

6 classes · 18 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Apache Jena — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

SPECTRAL

Apache Jena API Rules

19 rules · 8 error-severity 7 warn-severity 4 info-severity

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

Binding

3 properties

JSON SCHEMA

DatasetList

1 properties

JSON SCHEMA

DatasetRequest

2 properties

JSON SCHEMA

Dataset

3 properties

JSON SCHEMA

RDFTerm

4 properties

JSON SCHEMA

SparqlResults

3 properties

JSON SCHEMA

JSON Structure 6

JSON Structure definitions describing this provider's data shapes.

Fuseki Sparql Api Binding Structure

3 properties

JSON STRUCTURE

Fuseki Sparql Api Dataset List Structure

1 properties

JSON STRUCTURE

Fuseki Sparql Api Dataset Request Structure

2 properties

JSON STRUCTURE

Fuseki Sparql Api Dataset Structure

3 properties

JSON STRUCTURE

Fuseki Sparql Api Rdf Term Structure

4 properties

JSON STRUCTURE

Fuseki Sparql Api Sparql Results Structure

3 properties

JSON STRUCTURE

Examples 6

Example request and response payloads for these APIs.

Fuseki Sparql Api Binding Example

0 fields

EXAMPLE

Fuseki Sparql Api Dataset Example

3 fields

EXAMPLE

Fuseki Sparql Api Dataset List Example

1 fields

EXAMPLE

Fuseki Sparql Api Dataset Request Example

2 fields

EXAMPLE

Fuseki Sparql Api Rdf Term Example

4 fields

EXAMPLE

Fuseki Sparql Api Sparql Results Example

3 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Apache Jena Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Apache Jena Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Apache Jena Agentic Access

11 operations · 7 acting

AGENTIC

Use Cases 4

What developers build with this provider.

Knowledge Graph Management

Build and query knowledge graphs using RDF and SPARQL.

Linked Data Publishing

Publish Linked Data endpoints with Fuseki SPARQL server.

Semantic Search

Enable semantic search over structured RDF datasets.

Data Integration

Integrate heterogeneous data sources using RDF as a common data model.

Integrations 3

Pre-built integrations with other platforms and tools.

Apache Solr

Integrate full-text search with SPARQL queries via Solr text index.

Elasticsearch

Full-text search integration for Fuseki text search capabilities.

Spring Framework

Spring integration for Jena RDF operations in enterprise Java apps.

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Versioning

Versioning

SpectralRules

SpectralRules

Vocabulary

Vocabulary

Build 3

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

GitHubRepository

GitHubRepository

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

License

TermsOfService

DataLicense

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: apache-jena
name: Apache Jena
description: Apache Jena is a Java framework for building Semantic Web and Linked Data applications. It provides APIs for
  RDF, SPARQL, OWL, and a triplestore database (TDB2) along with the Fuseki SPARQL server with a REST API for querying and
  managing RDF datasets.
type: Index
deliveryModel:
  model: open-core
  license: Apache-2.0
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/apache-jena.png
tags:
- Java
- Linked Data
- OWL
- Ontology
- Open Source
- RDF
- Semantic Web
- SPARQL
tags_raw:
- Java
- Linked Data
- OWL
- Ontology
- Open Source
- RDF
- Semantic Web
- SPARQL
- Open-Source
created: '2026-03-16'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/apache-jena/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: apache-jena:java-api
  name: Apache Jena Java API
  description: The Jena Java API provides programmatic access to RDF model creation, SPARQL query execution, OWL reasoning,
    and TDB2 triplestore management for building Semantic Web applications.
  humanURL: https://jena.apache.org/documentation/
  tags:
  - Java
  - OWL
  - RDF
  - SDK
  properties:
  - type: Documentation
    url: https://jena.apache.org/documentation/
  - type: GettingStarted
    url: https://jena.apache.org/tutorials/
- aid: apache-jena:apache-jena-dataset-management-api
  name: Apache Jena Dataset Management API
  description: Dataset administration
  humanURL: https://jena.apache.org/documentation/fuseki2/
  tags:
  - Dataset Management
  properties:
  - type: OpenAPI
    url: openapi/apache-jena-dataset-management-api-openapi.yml
  - type: Documentation
    url: https://jena.apache.org/documentation/fuseki2/
- aid: apache-jena:apache-jena-graph-store-protocol-api
  name: Apache Jena Graph Store Protocol API
  description: SPARQL Graph Store HTTP Protocol operations
  humanURL: https://jena.apache.org/documentation/fuseki2/
  tags:
  - Graph Store Protocol
  properties:
  - type: OpenAPI
    url: openapi/apache-jena-graph-store-protocol-api-openapi.yml
  - type: Documentation
    url: https://jena.apache.org/documentation/fuseki2/
- aid: apache-jena:apache-jena-sparql-query-api
  name: Apache Jena SPARQL Query API
  description: SPARQL 1.1 Query operations
  humanURL: https://jena.apache.org/documentation/fuseki2/
  tags:
  - SPARQL Query
  properties:
  - type: OpenAPI
    url: openapi/apache-jena-sparql-query-api-openapi.yml
  - type: Documentation
    url: https://jena.apache.org/documentation/fuseki2/
- aid: apache-jena:apache-jena-sparql-update-api
  name: Apache Jena SPARQL Update API
  description: SPARQL 1.1 Update operations
  humanURL: https://jena.apache.org/documentation/fuseki2/
  tags:
  - SPARQL Update
  properties:
  - type: OpenAPI
    url: openapi/apache-jena-sparql-update-api-openapi.yml
  - type: Documentation
    url: https://jena.apache.org/documentation/fuseki2/
common:
- type: Plans
  url: plans/apache-jena-plans-pricing.yml
- type: RateLimits
  url: rate-limits/apache-jena-rate-limits.yml
- type: FinOps
  url: finops/apache-jena-finops.yml
- type: Website
  url: https://www.apache.org/
- type: IssueTracker
  url: https://github.com/apache/jena/issues
- type: SecurityPolicy
  url: https://github.com/apache/jena/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/apache/.github/blob/main/.github/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/apache/jena/blob/main/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/apache/jena/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/apache-jena-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/apache-jena-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/apache-jena-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/apache
- type: GitHubRepository
  url: https://github.com/apache/jena
- type: Documentation
  url: https://jena.apache.org/documentation/
- type: GettingStarted
  url: https://jena.apache.org/tutorials/
- type: TermsOfService
  url: https://www.apache.org/licenses/LICENSE-2.0
- type: Versioning
  url: https://jena.apache.org/about_jena/releases.html
- type: SpectralRules
  url: rules/apache-jena-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/apache-jena-vocabulary.yaml
- type: Features
  data:
  - name: SPARQL Query and Update
    description: Full SPARQL 1.1 query and update protocol support via Fuseki REST API.
  - name: RDF Model API
    description: Java API for creating, reading, and manipulating RDF graphs.
  - name: OWL Reasoning
    description: OWL and RDFS inference via Jena's rule-based and OWL reasoners.
  - name: TDB2 Triplestore
    description: Native high-performance RDF triplestore for persistent graph storage.
  - name: Graph Store Protocol
    description: SPARQL Graph Store HTTP Protocol for named graph management.
  - name: Multiple RDF Formats
    description: Support for Turtle, JSON-LD, N-Triples, RDF/XML, and TriG serialization.
  - name: Ontology API
    description: High-level API for working with OWL and RDFS ontologies.
- type: UseCases
  data:
  - name: Knowledge Graph Management
    description: Build and query knowledge graphs using RDF and SPARQL.
  - name: Linked Data Publishing
    description: Publish Linked Data endpoints with Fuseki SPARQL server.
  - name: Semantic Search
    description: Enable semantic search over structured RDF datasets.
  - name: Data Integration
    description: Integrate heterogeneous data sources using RDF as a common data model.
- type: Integrations
  data:
  - name: Apache Solr
    description: Integrate full-text search with SPARQL queries via Solr text index.
  - name: Elasticsearch
    description: Full-text search integration for Fuseki text search capabilities.
  - name: Spring Framework
    description: Spring integration for Jena RDF operations in enterprise Java apps.
- type: DataLicense
  url: data-license/apache-jena-data-license.yml
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com

Apache Jena API — frequently asked questions

Does Apache Jena have an API?

Yes. APIs.io lists 5 APIs from Apache Jena, including Apache Jena Java API, Apache Jena Dataset Management API and Apache Jena Graph Store Protocol API, and 2 more.

Is there an OpenAPI specification for the Apache Jena API?

Yes. APIs.io indexes 4 OpenAPI specifications for Apache Jena, each linked for download from this page.

How much does the Apache Jena API cost?

APIs.io lists 3 pricing plans for Apache Jena, with each plan's price, limits and inclusions under Pricing on this page.

Is the Apache Jena API ready for AI agents?

Apache Jena has a Kin Score of 38.0 out of 100 (thin) and an Agent Readiness score of 22.1 (agent-aware), scored by API Evangelist on 2026-11-13.

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