Thanks for the links @intrz very interesting video interview.
The Underlay appears to lend itself towards the way Safe will work (Append Only, history, immutable and consistent data representation) so may be worth leaving the door open to. Timely to consider given that the team is considering ways to bake RDF, linked data in.
From: “The Future Of Knowledge” at https://underlay.pubpub.org/
Comparisons to Other Public Knowledge
The Semantic Web is a public machine-readable collection of data with a certain format posted to any public web page. Like the Underlay, the Semantic Web contains has public assertions of relationships between entities. However, there is little provenance for these assertions beyond what is implied by the page that published the data. Assertions are made and discovered ad hoc. All assertions are editable by the page owners, with no requirement to maintain history, immutability or consistency. Different semantics of relationships and entities are used by different publishers, who bear the burden of publishing their own data.
Linked data (or linked open data) is a promising way of representing information by breaking it into a set of assertions, each of which is a triplet of subject and predicate joined by a relationship. The terms ideally link to a Web site or service that defines it. Linked data can represent knowledge without over-simplifying it to fit a set of expected fields, or committing to a schema beforehand. It also enables stitching together information from different collections. Unlike the Underlay, linked data is just a way of representing information. It is not append-only; data points are often not timestamped and can be edited in place. Including provenance for each triple is not standardized and can be complex. The Underlay could make use of the format, and work with existing linked data collections.
Also worth reading “The Underlay Project: patterns for crystallizing knowledge” also at above link.