Typo in $id for item-spec common.json

[omad]

Background

While implementing automatic validation of STAC documents in ODC Explorer I discovered that the $id in item-spec/json-schema/common.json has a typo. It's missing a dot.

stac-spec/item-spec/json-schema/common.json

Lines 2 to 4 in 8ba4e47

	"$schema": "http://json-schema.org/draft-07/schema#",
	"$id": "https://schemas.stacspec.org/v1.1.0/item-spec/json-schema/commonjson",
	"title": "STAC Common Metadata",

By my reading of the JSON Schema specification, this should have broken usage of the schema. Since sub-schemas should be stored and referenced by their declared $id.

Fortunately/unfortunately, most validators instead use the URL the sub-schema can be downloaded from and carry on happily.

Fix/Release/Version

It's a simple fix to make, however, I'm unsure whether it:

• Should just be patched in to the current spec version. Most validators seem to ignore it, but, there's a chance it might break something somewhere that has it stored by $id.
• Or, include the fix in the next version release.

[gadomski]

IMO this is what PATCH versions are for, so a fix could/should be part of a v1.1.1.