Proposal: URI feature syntax

[b-wils]

Discussed in #3

^{Originally posted by mbasaglia November 28, 2023}
We need a way of referencing objects, properties, etc within the specs. This is useful in several places, for example profile definitions (#1) and can-i-lottie.

Assuming the schema in #2 is merged, I propose using URI-references similar to what $ref would use in the schema to refer to a specific definition.

Examples:

#/$defs/shapes/rectangle
#/$defs/shapes/rectangle/position

These are technically relative to the schema but I don't think they need to be fully qualified.

For profile definitions I propose using the notation described above to include parts of the schema, and the ! prefix to exclude specific definitions.

[jbeta51]

As discussed in the weekly spec meeting, we're moving this discussion to a post-1.0 timeline. We'll keep this open and revisit this when we start discussing profiles.