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DCAT: harvestable exposure (embed JSON-LD / content negotiation) #30

Description

@sorenwacker

Part of #24. Depends on the RDFLib serialization sub-issue.

Goal

Make the DCAT metadata harvestable so external FAIR tools (e.g. F-UJI) can read it — embedding/serving DCAT, not just writing a file.

Scope

  • Embed DCAT JSON-LD in the dataset landing page (UI/REST), and/or expose content negotiation (Accept: text/turtle | application/ld+json) on a dataset URL.
  • Consider signposting / typed links (rel="describedby").

Why

F-UJI and similar assessors score from discoverable metadata (embedded JSON-LD, content negotiation, signposting) — a standalone file is not harvested. See discussion #25 (F-UJI note).

Acceptance criteria

  • A dataset landing page carries valid embedded DCAT JSON-LD, and/or content negotiation returns Turtle/JSON-LD.
  • Verified by fetching the page and extracting the DCAT graph.

Depends on: RDFLib serialization. Enables: F-UJI CI sub-issue.

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