This composition of applications provides a solution for hosting material science data for projects in the material digital initiative to participate in a decentralized linked data space with a central data portal instance. It also features an ontology agnostic transformation pipeline and a triple store integration.

• Central Component is a CKAN instance as data management system, with default views for pdf, images, text, csv, html, markdown.
• A apche jena fuseki triple store at a sublocation /fuseki
• A plugin to create accompanying named graphs in jena fuseki for semantic data contained in ckan datasets including sparql endpoint publication and a user-friendly sparql query interface known as sparklis
• a pipeline for transforming complex csv data common in the domain to csvw metadata
• A rule based mapping pipeline to combine rdf containing data with knowledge graphs to represent material data, its measurement routine and the processing. A tutorial and the steps involved can be found here.

Before you begin, make sure you have the following installed:

• Docker
• Docker Compose

1. Clone this repository to your local machine and init submoduls:

   git clone https://github.com/materialdigital/pmd-ckan.git
   git submodule update --init

2. Navigate to the pmd-ckan directory:

   cd pmd-ckan

3. create a .env file, use (example.env)[config/example.env] as a template

   all variables starting with CKANEXT__ will be translated to the ckan.ini removing CKANINI__, replacing "__" with "." and putting the name to lowercase examples: CKANINI__CSVTOCSVW__FORMATS -> csvtocsvw.formats CKANINI__CSVTOCSVW__SSL_VERIFY -> csvtocsvw.ssl_verify

4. replace all values in <> braces or are comented to be changed

5. make changes according to your ssl or proxy configuration in config/nginx/default.template

6. Run the docker compose stack, it will pull and build the necessary containers

   docker compose up

7. After first successful startup, login into ckan with the admin password you defined in your .env

8. create an API token for the supervisor background tasks at /user/<ckan_admin_user>/api-tokens, and paste it into your .env file at BACKGROUNDJOBS_API_TOKEN

9. restart the docker compose stack in detached mode

   docker compose down
   docker compose up -d

Debug and Development Mode

docker compose -f compose.dev.yaml up -d

CKAN plugins in folder ./ckan_plugins will be shared to the ckan container and the server reloads on changes to files for extention test adn development.

The authors would like to thank the Federal Government and the Heads of Government of the Länder for their funding and support within the framework of the Platform Material Digital consortium. Funded by the German Federal Ministry of Education and Research (BMBF) through the MaterialDigital Call in Project KupferDigital - project id 13XP5119.