feat (core): Introduce Enola's new YAML RDF & TextProto format

[vorburger]

See also #765 ?

Goals:

• For writing ✍️ and reading by humans, 🤠 not machines 🔫 🔥
• Whitespace 🐻‍❄️ 🤍
• RDF Data model (not any specific existing data model)
• Datatypes implied by schema, not explicitly written
• YAML or JSON (no & * links)
• XML?

Implementation:

• *.rdf.yaml
• MediaType propose e.g. text/rdf+yaml, with charset , try with IANA registration
• NO schema
• Disable Flow Style? Then it's not YAML, anymore! Configurable via URL parameter?
• Tags for Prefixes?
• Context, for JSON-LD? %CONTEXT would be cool, but is technically reserved... does it work anyway??
• Context is OPTIONAL. Implementations are NOT required to support.
• !typeCURIE instead of a (like in TTL) or is-a
• %BASE, default to file's own URL
• .LOAD e.g. for standard prefixes
• &Anchors ⚓ as IRI, relative to BASE
• *Links! But they are forward only, and in-document only; so we also support or even just text, when schema infers
• Datatypes via !!xsd:dateTime TAG
• Datatypes omitted; only inferred via type. Separate?
• NLS multi-lang simply as Map! Could JSON-LD Context do that transformation? Else just hard-code it, no biggie.
• Duplicate Keys are errors
• YAML Schema, formally
• Streaming, not DOM; impl
• Implement it as SnakeYAML to Thing API, nor directly RDF4j, but write thin Thing to Model pass through adapter.
• Release it as a separate small CLI tool eventually #later
• TextProto generic exact equivalent; see thing.proto
• Rosetta yaml2ttl
• Rosetta in Bulk with glob; not single
• Transparent encrypt and decrypt, see Initial Cryptographic Support to have (some parts of) models en/de/crypted #284
• Review: Guha, Manu Sporny, TBray, EMF Ed, XML Edd, lbo & pos, ...
• Paper! 📜 Credit e.g. HUTN, and ESON and mon

[vorburger]

How about another CURIE separator, perhaps like this it's nicer to read;

Suggested change

	# foaf:firstName: Pablo
	foaf#firstName: Pablo

[vorburger]

https://github.com/cabo/kramdown-rfc/wiki/Syntax has some other interesting 🤔 ideas.