Review Comment:
The contribution is relevant for the special issue on Semantic Web for Cultural Heritage and has a reasonably well-defined contribution that is of interest to many, but there is room for improvement. On one hand, the contribution is an implementation of n-ary relations as classes in RDF and OWL-2 property chains. On the other hand, the contribution is an implementation of temporality based on CIDOC CRM and OWL-Time.
The introduction to the article is rather lengthy and somewhat focused on the particular project this work is developed in the context of. A slightly more general presentation of the problem would increase the value of this and maybe attract more readers and citations.
For the background study, the authors have investigated CIDOC CRM , the Wikidata model, and the OWL-Time ontology. I would also expect to see a discussion of Yago which is a “time and space aware” ontology. The reference list is somewhat short, and not convincing that the authors have fully explored relevant research – particularly when it comes to implementations of n-ary relations where most references are to W3C papers. Even if this is considered to be a practitioner’s papers, it should clearly position itself within the related field of research and should have a more well-defined study on related work. It is also a bit confusing that some context and related work is covered in section 2, 3 and 4, but the more formal presentation of related work is given in section 6.
The main contributions are presented through discussions and examples. A more formal presentation of the proposed model is needed to pinpoint what exactly is proposed – otherwise, this work is a limited experience that is difficult for others to reuse in another context or to elaborate on.
The presentation is somewhat verbose and descriptive – and very readable with only a few cases where this reviewer finds odd phrases. Some more clearly stated issues and principles could significantly increase the visibility of the contribution and be helpful in judging if the solution fits the issues they attempt to address. As of now it the problem is described but I miss a clearer statement for instance in the form of a list of requirements.
The use of figure is good but some figures appear rather repeatable (why separate figures for 2 and 3?).
The contribution lacks a presentation of a systematic evaluation, although there are hints in the conclusion that some evaluation has been performed. A separate evaluation section with a more elaborate presentation of experience and any more formal evaluations that have been performed would contribute significantly to the value of this article.
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