Relative links in schemas break (some) schema parsers

[mbaudis]

When referencing the JSON Schema versions some parsers fail at relative references. At least json_ref_dict:

$ref: https://w3id.org/ga4gh/schema/vrs/2.0.1/json/Variation

fails to follow "$ref": "/ga4gh/schema/vrs/2.0.1/json/Adjacency" in that document:

json_ref_dict.exceptions.DocumentParseError: Failed to load base document of /ga4gh/schema/vrs/2.0.1/json/Adjacency#/.

And when jumping to the next level:

$ref: https://w3id.org/ga4gh/schema/vrs/2.0.1/json/Adjacency

... same for "$ref": "/ga4gh/schema/gks-core/1.0.0/json/Extension"

json_ref_dict.exceptions.DocumentParseError: Failed to load base document of /ga4gh/schema/gks-core/1.0.0/json/Extension#/.

... etc.

[jsstevenson]

At a glance, it looks like the issue with json_ref_dict is that it only supports relative reference resolution to a local filesystem, right?