RO Crate 1.3

[OliverWoolland]

Bumping ROCrate version from 1.1 to 1.3 with downstream casualties

[Copilot]

Copilot review overview

🟡 Changes recommended

Public API documentation is inconsistent with runtime behavior, and one documented output example fails when used as written.

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Review effort: Balanced
Findings: 1 · 4

Open (5)

• Test empty-key and empty-value validation independently · New
• Align URL contract with the validation actually performed · New
• Pass the complete output filename to writeOut · New
• Document the actual duplicate-key and empty-value behavior · New
• Fix the spelling of “additional” · New

What changed in this PR

Upgrades RO-Crate serialization and examples to specification 1.3 while adding custom JSON-LD context support.

Changes:

• Updates default context and conformance references to RO-Crate 1.3.
• Adds ROCrate::addContext.
• Refreshes integration tests, fixtures, and usage documentation.

File	Description
include/​ro-crate.hpp	Implements 1.3 serialization and custom contexts.
README.md	Documents entity creation, contexts, and output.
tests/​unit.cpp	Adds context and entity validation tests.
tests/​integration.cpp	Updates and expands 1.3 examples.
tests/​fixtures/​minimal-example-of-ro-crate.json	Updates the minimal fixture to 1.3.
tests/​fixtures/​example-with-web-resources.json	Updates context metadata to 1.3.
tests/​fixtures/​example-with-file-directory.json	Adds the attached-package fixture.
tests/​fixtures/​ro-crate-which-focus-on-multiple-contextual-entities.json	Adds a custom-context fixture.
tests/​fixtures/​example-with-file-author-location.json	Removes the superseded 1.1 fixture.

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