More templating (v5 proposal) - sgpinkus/json-schema GitHub Wiki

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NOTE: This has been migrated to https://github.com/json-schema-org/json-schema-spec/issues/56

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Proposed keywords

Uses existing keywords - proposes extension of rel in LDOs.

Other keywords in LDOs could also be subject to this (e.g. mediaType) - however, rel is the most obvious candidate as it is also a URI.

(Yes, in case that was unclear - link relation values are basically all secretly URIs.)

Purpose

Currently, the only property of links that is templated is "href". However, some data formats actually include other link information in the data as well - most often rel (although sometimes others such as media type).

Values

The allowed values would be exactly the same as for href (including the extended templating syntax, if applicable).

Behaviour

To obtain the value for the link relation, the value of rel is interpreted in exactly the same way as href.

Concerns

The use of { and } characters in URIs is very rare, and highly unwise - this includes values for rel.

As such, it is probably safe to allow rel to have the same behaviour as href, and this is unlikely to cause incompatability with existing v4 schemas.

If $data makes it into the standard, then we probably don't need to enable templating for anything apart from href and rel - everything else can be referenced wholesale from the data.