Review Comment:
In this paper, the authors propose the notion of nested facet systems (NSFs) for human-data interaction. They then propose a method to transform ontologies to NFSs. The idea of introducing NSFs is quite interesting and seems to be useful in practice, especially for information retrieval. However, I think the presented work is too preliminary to ensure publication in a journal. Significant extension is necessary. Some suggestions are given as follows.
First, completeness of NFS should be defined in section 2 and some properties of the soundness and completeness should be given.
Second, examples of NFS should be given, in which areas can NFS be applied? My understanding is that NFS can be used in many applications where IR is applied, but the authors should specify these applications.
Third, Section 4 is not well written. The authors claim that they will discuss about completeness and soundness of NFS in details and give examples, but the "examples" given in this section are high level and not intuitive, and no formal proof of the completeness and soundness of NFS for SNOMED CT and NCIt is given. This section should be significantly modified.
Fourth, related work should be given for NFS. Hierarchical labels should have been used in machine learning, authors should do a survey on this and discuss related work in details. It seems that the authors totally ignore related work and only give a formal definition of the hierarchical labels.
Fifth, the authors should provide a method for transforming an ontology in OWL to NFS and prove its soundness and completeness if possible.
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