The field of Open Information Extraction has been trying to do that in a generic way for a long time, but the results are still far from good. A few references:

The field of Open Information Extraction has been trying to do that in a generic way for a long time, but the results are still far from good. A few references: OpenIE [1] Graphene [2] MinIE [3]. If you already have a Knowledge Graph (KG) and want to populate its instances from documents, that's called KG Population, and Knowledge-net [4] is a good reference. Relation Extraction is another interesting approach if you know which kind of relations you're interested in, OpenNRE [5] a good example. [1] https://github.com/dair-iitd/OpenIE-standalone https://github.com/dair-iitd/OpenIE-standalone [2] https://github.com/Lambda-3/Graphene https://github.com/Lambda-3/Graphene [3] https://github.com/uma-pi1/minie https://github.com/uma-pi1/minie [4] https://github.com/diffbot/knowledge-net https://github.com/diffbot/knowledge-net [5] https://github.com/thunlp/OpenNRE https://github.com/thunlp/OpenNRE