Review Comment:
First of all, I do want to commend the authors for their thorough response. Well done! I appreciate that writing a review of this span is a demanding endeavor and that the results will never be satisfactory to all. The concerns mention below are hence to be interpreted with these premises in mind.
Claim: We do not assume the definitions at the beginning
See Section 3
3.1: The authors name definitions pertaining to facts. None of the definitions pertain to *how* the truth value of facts is assessed. Then comes the statement "Note that facts themselves cannot be observed directly" (pertains to the assessment of truth values, statement without references). Is this is claim by the authors? If yes, it violates the author's claim that they do not assume definitions at the begining. If no, then it is really surprising and unrelated to the previous definitions. Clearly, none of the definitions provided forbids the direct observation of facts (some actually seem to assume it but it might just be my bias in interpretation). Consider the fact "This is a review". It fits all six definitions but can also be observed directly (at least in some sense of observing). Mixes of definition and opinions (which I take the statement pertaining to observing facts to be) are still to be found in several other fragments of this section. The authors claim they merely expatiate upon relevant concepts but I would still suggest they do more and intertwine a predefined model, probably unbeknownst of themselves. It'd be great if the authors would check especially Section 3 sentence by sentence to ensure that there are no biases.
Q1: "“facts are what is represented in KGs or KBs”." I am afraid this is still not true. For example, a property graph can consist of exactly one node. A node is not a fact. Still, said KG would represent the node. It follows that your statement cannot be correct.
Q2: Thanks for the improved text. Sounds good!
Q3: See answer to Q2.
Q4: OK.
Q5: Fair.
Q1: Cheers.
Q2: That does make sense. Great.
Q3: Thanks.
Q4: Does read better.
References:
Please do check your references. A cursory reading suggests the following missing/incorrect data.
[7] I do wonder why there are no links added for this paper. It is available at http://cj2015.brown.columbia.edu/papers/automate-fact-checking.pdf
[32] in In. Please check.
[48] ISWC papers usually have DOIs. Please check.
[55] to [59]: The same author seems to have different names. Error in bib file? I do wonder why you cite a demo paper instead of the main paper for [59], which is
Syed, Zafar Habeeb, Michael Röder, and Axel-Cyrille Ngonga Ngomo. "Unsupervised discovery of corroborative paths for fact validation." In International Semantic Web Conference, pp. 630-646. Springer, Cham, 2019.
Overall, the document is well suitable for non-domain experts and beginners. The presentation is comprehensive and the addition of an ontology is definitely appreciated.
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