RDF – Resource Description Framework
The Resource Description Framework is a family of World Wide Web Consortium specifications originally designed as a metadata data model. It has come to be used as a general method for conceptual description or modeling of information that is implemented in web resources, using a variety of syntax notations and data serialization formats.
From RDF on Wikipedia
Daniel Mahal did a test with turtle data and ldf.fi rdf-grapher https://www.ldf.fi/service/rdf-grapher?rdf=http://rdf-turtle.surge.sh/index.ttl&from=ttl&to=svg . See source https://rdf-turtle.surge.sh/index.ttl
See Turtle is a format for expressing RDF data for an example of turtle markup.
References
See D2RQ – Accessing Relational Databases
as Virtual RDF Graphs, an application for accessing relational databases as RDF graphs to potentially store in Triplestores.
RDF JavaScript Libraries – https://rdf.js.org/