portaljs-add-dcat

# PortalJS — Add DCAT ## Overview Turn an existing PortalJS (`portaljs-catalog`) portal into a harvestable data catalog. PortalJS is Frictionless-native — a dataset is a Data Package (see `portaljs-define-schema`) — and DCAT is the serialization + harvest layer on top (`lib/metadata/dcat.ts` + `lib/metadata/dcat-profiles.ts`). This skill selects one or more DCAT application profiles, maps every dataset's metadata to them, and writes static feed files at build time — JSON-LD, Turtle, and RDF/XML — so external catalogs (data.europa.eu, data.gov, national portals) can harvest the datasets automatically, on any static host, with no runtime. ## Prerequisites - A scaffolded PortalJS portal with `datasets.json`, `package.json`, and `lib/metadata/` (the metadata-profile contract) present. - `lib/metadata/dcat.ts` (the DCAT-3 core) already in place — profiles augment it. - Node 18+ and npm available in the portal directory. - For DCAT-AP / DCAT-US: a publishing organization (name + homepage) and a contact (name + email) — both profiles require `dct:publisher` and `dcat:contactPoint`. - Optional but recommended: network access to run SHACL conformance checks against the official EU ITB validator or `pyshacl`. ## Instructions The canonical, full step-by-step workflow is [`.claude/commands/portaljs-add-dcat.md`](https://github.com/datopian/portaljs/blob/main/.claude/commands/portaljs-add-dcat.md) — the single source of truth. Read and follow it when executing. Summary: 1. Ga...