External dependencies

Node packages

• The frontend application is built with React.js. You may find this reference on react hooks helpful.
• The frontend components use Material UI. You may find the “Components” and “Component API” section of the documentation helpful.
• Express.js is used to serve the backend APIs. You may find this routing guide helpful.

Data storage technologies

MongoDB

We use MongoDB to store user information, mongoose for modelling the data, and mongoose-gridfs for using the GridFS API.

Ontotext GraphDB

We use GraphDB to store the rest of the data. The GraphDB interface can be accessed at http://localhost:7200 after you start the docker container. You can use the interface to write SPARQL queries. There will be a tutorial for the interface the first time you launch it.

RDF (Resource Description Framework)

RDF is a framework and a standard for representing and describing information on the web.

In RDF, information is represented using triples, consisting of three parts:

• Subject: The resource being described
• Predicate: The attribute of the resource
• Object: The value or target of the attribute

For example, a user named Parker with the user id of 1 can be represented as the following:

• Subject: user_1
• Predicate: hasName
• Object: Parker

Parker may have other attributes, such as age, represented in another triple:

• Subject: user_1
• Predicate: hasAge
• Object: 21

SPARQL

SPARQL is a query language for RDF data.

Here are some examples of SPARQL queries corresponding to the javascript code:

Find all primary contacts

const all_primary_contact = PrimaryContactModel.find({})

PREFIX : <http://cmmp#>
CONSTRUCT {
  ?s ?p0 ?o0
} WHERE {
  ?s ?p0 ?o0.
  ?s rdf:type owl:NamedIndividual, :primary_contact.
}

Find all primary contacts with the last name Parker

const primary_contacts_with_last_name = PrimaryContactModel.find({last_name: "Parker"})

PREFIX : <http://cmmp#>
CONSTRUCT {
  ?s ?p0 ?o0
} WHERE {
  ?s ?p0 ?o0.
  ?s rdf:type owl:NamedIndividual, :primary_contact.
  ?s :has_last_name ?o0_0.
  FILTER(?o0_0 = "Parker")
}

Find a primary contact with the last name Parker and the email user@example.com

const primary_contact_with_email = PrimaryContactModel.find({last_name: "Parker", email: "user@example.com"})

PREFIX : <http://cmmp#>
CONSTRUCT {
  ?s ?p0 ?o0
} WHERE {
  ?s ?p0 ?o0.
  ?s rdf:type owl:NamedIndividual, :primary_contact.
  ?s :has_last_name ?o0_0.
  FILTER(?o0_0 = "Parker")
  ?s :has_email ?o0_3.
  FILTER(?o0_3 = "user@example.com")
}