Task 3 #A node project to implement a HTTP server for Task 3
└── app.js # The server code (TODO: complete)
└── index.html #The Web page
└── package.json #A JSON used by Node.

Go to https://solid.interactions.ics.unisg.ch/idp/register/ and create a Solid Pod for each group member.

WARNING: If you edit your WebID profile with a file that is not a proper Turtle document, you will lose access to your Pod. You can use a Turtle editor (e.g., https://ci.mines-stetienne.fr/teaching/semweb/turtle.html) to edit your profile and ensure that it satisfies the right Turtle syntax.

Use a Pod editor, such as Penny (https://penny.vincenttunru.com) to edit your Pod. Your Pod provider is https://solid.interactions.ics.unisg.ch/.

One group member creates in his/her Pod a Turtle page to represent the group and indicates the group members using the FOAF ontology.

To make the created profile readable by anyone do so, use the Penny application to create the Access Control List for the created Turtle document and set the read permission for everyone in this control list. You also need to set the write permission to be able to make further changes to your document.

Example of such a group: https://solid.interactions.ics.unisg.ch/jlemee/bcs-ds-2023-ta-group

The group members updates their WebId profiles to indicate their name, mail box, and group they belong to.

Example of such a profile: https://solid.interactions.ics.unisg.ch/jlemee/profile/card#me

These different pages should be linked in the Report.

Use a Linked Data browser, such as these Chrome: https://chromewebstore.google.com/detail/openlink-structured-data/egdaiaihbdoiibopledjahjaihbmjhdj or Firefox: https://addons.mozilla.org/en-GB/firefox/addon/rdf-browser/ plugins, to navigate the distributed social graph.

Install Comunica with:

npm install -g @comunica/query-sparql

1. Perform a comunica-sparql query to get your group from your WebId.

Install Comunica for Link Traversal with:

npm install -g @comunica/query-sparql-link-traversal

2. Perform a comunica-sparql-link-traversal query to get all group members from your WebId. Compare with the result of the request performed without link traversal.

You can use the syntax subject (predicate)+ object in your SPARQL query to follow the links providedin the subject or resource.

Use the application MediaKraken (https://noeldemartin.github.io/media-kraken/) to add movies to the Solid Pod of at least one member of yourgroup. After that, the movies are included as files in the \texttt{movies} container in the pod but the \texttt{movies} folder is not public. To do so, use the Penny application to create the Access Control List for the created \texttt{movies} container and set the read permission for everyone in this control list. Look at https://solid.interactions.ics.unisg.ch/jlemee/movies/ for an example of such a created container

You should then complete the provided JavaScript project template (folder Task 3 in the GitHub project) for creating a Node Web application, using the Comunica framework (https://comunica.dev/docs/query/getting_started/query_app/), that retrieves the names and images of all movies stored in your Pod by MediaKraken.

You should use the QueryEngine called engine to perform Comunica requests. You can perform a new query within the then method of a given query. Complete the SPARQL requests in the engine queries.

You can use the command bash npm i to load the node modules from the Task 3 folder.

You can then use the command bash npm start to start the application. Then, go to http://localhost:5000 to see the Web page.

Finally, we ask you to explore the possibilities of your Linked Data environment: Extend app.js with functionality that performs at least one additional SPARQL query to implement useful functionality for your users. For instance, you might query movies across all members of your team; or you might create a search engine that retrieves all movies that have been published in a given year.