RDF primer but using Turtle (older doc):
https://www.w3.org/2007/02/turtle/primer/
Audio (etc) plugin format that uses .ttl:
https://gitlab.com/lv2/lv2/-/tree/master/lv2/core.lv2
https://gitlab.com/lv2/lv2/-/tree/master/schemas.lv2
https://drobilla.net/software/sord https://drobilla.net/software/serd
drobilla has mentioned that, if there was a C JSON-LD lib, that might be enough to warrant an LV3
For more: https://github.com/lv2/lv2/wiki
P.S. not many people know that LV2 does modular synth style CV https://linuxmusicians.com/viewtopic.php?t=20701&p=112242