The semantic web is a silly dream of the 90s and 00s. It's not a realizabile technology, and Google basically showed exactly why: as soon as you have a fixed algorithm for finding pages on the web, people will start gaming that algorithm to prioritize their content over others'. And I'm not talking about malicious actors trying to publish malware, but about every single publisher that has theoney to invest in figuring out how and doing it.
So any kind of purely algorithmic, metadata based retrieval algorithm would very quickly return almost pure garbage. What makes actual search engines work is the constant human work to change the algorithm in response to the people who are gaming it. Which goes against the idea of the semantic web somewhat, and completely against the idea of a local-first web search engine for the masses.
I would encourage you to go and read more about triples/asserting facts, and the trust/provenance of facts in this context.
You are basically saying "it's impossible to make basic claims" in your comment, which perhaps you don't realize
So any kind of purely algorithmic, metadata based retrieval algorithm would very quickly return almost pure garbage. What makes actual search engines work is the constant human work to change the algorithm in response to the people who are gaming it. Which goes against the idea of the semantic web somewhat, and completely against the idea of a local-first web search engine for the masses.