When does properties for resources are generated?

[mata-r]

I am following the book instructions, and I don't have properties for the "extnCertification-db" resource in the mta.yaml file.

Repo

resources:
  - name: extnCertification-db
    type: com.sap.xs.hdi-container
    parameters:
      service: hana # or 'hanatrial' on trial landscapes
      service-plan: hdi-shared
    properties:
      hdi-service-name: ${service-name}

My application:

resources:
  - name: extnCertification-db
    type: com.sap.xs.hdi-container
    parameters:
      service: hana
      service-plan: hdi-shared

What exactly is the property hdi-service-name ?
Please advise