How to add article to related resources

[mesemus]

In NMA as well as in production repositories, we would like to have a proper citation of a related article. This means that we need at least:

• publisher
• journal
• volume
• issue
• pages

Could these be added as optional fields to CCMM? For more details, see model of the document repository at https://github.com/Narodni-repozitar/nr-model/blob/2.0/models/nr_datatypes_2.0.yaml#L366

[MichalMed]

create new subclass of resource named "citable resource" (??), limit values of its resource type to article (and maybe some others) and add optional attributes journal, volume, issue and pages