The Knowledge Graph notebook

LinkedDataHub (LDH) is open source software you can use to manage data, create visualizations and build apps on RDF Knowledge Graphs.

What's new in LinkedDataHub v3? Watch this video for a feature overview:

We started the project with the intention to use it for Linked Data publishing, but gradually realized that we've built a multi-purpose data-driven platform.

We are building LinkedDataHub primarily for:

• researchers who need an RDF-native notebook that can consume and collect Linked Data and SPARQL documents and follows the FAIR principles
• developers who are looking for a declarative full stack framework for Knowledge Graph application development, with out-of-the-box UI and API

What makes LinkedDataHub unique is its completely data-driven architecture: applications and documents are defined as data, managed using a single generic HTTP API and presented using declarative technologies. The default application structure and user interface are provided, but they can be completely overridden and customized. Unless a custom server-side processing is required, no imperative code such as Java or JavaScript needs to be involved at all.

Follow the Get started guide to LinkedDataHub. The setup and basic configuration sections are provided below and should get you running.

Setup

Click to expand

Configuration

Click to expandCATALINA_OPTS SELF_SIGNED_CERT SIGN_UP_CERT_VALIDITY IMPORT_KEEPALIVE MAX_CONTENT_LENGTH MAIL_SMTP_HOST MAIL_SMTP_PORT GOOGLE_CLIENT_ID GOOGLE_CLIENT_SECRET

Documentation

Command line interface

LinkedDataHub CLI wraps the HTTP API into a set of shell scripts with convenient parameters. The scripts can be used for testing, automation, scheduled execution and such. It is usually much quicker to perform actions using CLI rather than the user interface, as well as easier to reproduce.

The scripts can be found in the scripts subfolder.

The CLI scripts internally use Jena's CLI commands. Set up the Jena environment before running the scripts.

An environment variable JENA_HOME is used by all the command line tools to configure the class path automatically for you. You can set this up as follows:

On Linux / Mac

export JENA_HOME=the directory you downloaded Jena to
export PATH="$PATH:$JENA_HOME/bin"

Sample applications

Third party

• NOI OpenDataHub – tourism Knowledge Graph portal powered by LinkedDataHub and @ontop. Source code.

Demo apps

These demo applications can be installed into a LinkedDataHub instance using the provided CLI scripts.

Before running app installation scripts that use LinkedDataHub's CLI scripts, set the SCRIPT_ROOT environmental variable to the scripts subfolder of your LinkedDataHub fork or clone. For example:

export SCRIPT_ROOT="/c/Users/namedgraph/WebRoot/AtomGraph/LinkedDataHub/scripts"

How to get involved

• contribute a new LDH application or modify one of ours
• work on good first issues
• work on the features in our Roadmap
• join our community

Test suite

LinkedDataHub includes an HTTP test suite. The server implementation is also covered by the Processor test suite.

Dependencies

Browser

Docker

Support

Please report issues if you've encountered a bug or have a feature request.

Commercial consulting, development, and support are available from AtomGraph.

Community