Available Implementation

[1] RDF Presentation
For a given range of RDF graphs and a specific media types, an RDF Presentation is a combination of lifting, lowering, and validation rules. With these rules, one can coherently interpret a representation as RDF (lift), validate the RDF graph, and generate back the representation from the RDF graph (lower).
While sending any kind of document, potentially lightweight, an HTTP server/client may refer to the specific RDF Presentation that is used. Then, the HTTP client/server can lift the document to RDF, and validate it.
Similarly, while requesting for an RDF graph, an HTTP server/client may inform the client/server what representation it prefers. Then, the client/server can validate the RDF graph, then lower it into a document [44].
[2] The CC/PP exchange protocol
The CC/PP exchange protocol based on the HTTP Extension Framework. CC/PP "Composite Capability/Preference Profiles: A user side framework for content negotiation", is an extensible format based on RDF for describing device capabilities and user preferences [27].
References
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Footnotes
[1] : RDF Presentation and RDF Presentation Negotiation.
[2] : Examples of CC/PP exchange protocol.