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If you're looking for ontologies: https://archivo.dbpedia.org/ https://lov.linkeddata.es/ But there's maybe 5k ontologies, how do you hope to overview them and learn about them? You should start from a specific (narrow) problem domain.


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Are these required and recommended properties only a thing which is understandable for the Google search algorithms to work well? Yes. Follow additional guidelines in the documentation for your specific type. E.g., for Movie: required properties are name and image. See also https://github.com/schemaorg/schemaorg/issues/1715.


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https://www.w3.org/annotation/ is what you need (http://www.w3.org/TR/annotation-model/, http://www.w3.org/TR/annotation-vocab/). This can be used for bookmarking or any other pointer or a comment on a web resource. You may need to invent a new motivation value. http://www.w3.org/TR/selectors-states/ may also be relevant as it allows to: say "this web ...


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Well yeah CSO is not an ontology but a thesaurus. Here's an idea: compare it to Microsoft Academic Graph's "Fields of Science". Also, you need to include some actual papers in your study, indexed with the two, and assess the accuracy/adequacy of indexing with the two topic thesauri.


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For a straight theme, use <doc> dc:subject "foo" To add confidence, you can use RDF*: << <doc> dc:subject "foo" >> my:confidence 0.962 But maybe RDF* is an overkill. You can use the NIF (NLP Interchange Format) ontology. Use its:taIdentRef to point to the theme (has to be a URL), and I think its:taIdentConf is ...


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Do you mean charters? See this search https://www.google.com/search?q=chartex+charter+annotation


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