Seems the page properties are specific to the RDF-export process, not for use by Logseq at all?
Knowledge Management for Tags / Tag Hierarchies - Feedback / Feature Requests - Logseq
Comments by @cldwalker :
In the meantime, I’m happy to share that generating rdf from logseq graphs is doable with nbb-logseq/examples/linked-data at main · logseq/nbb-logseq · GitHub . With the example, a small portion of Logseq’s docs are able to generate RDF.
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For examples, see the backlinks at https://docs.logseq.com/#/page/feature and https://docs.logseq.com/#/page/ui%20element
I’ll also mention I’m a linked data beginner so there are probably more correct ways to model some of the relations e.g. more use of sameAs instead of url. For now I’m trying to strike a pragmatic balance with rdf output without sacrificing usability in Logseq