Cannot parse JSON-LD document if the scheme of @base IRI is non-standard about rdflib-jsonld

[craig-willis]

Just ran into this issue trying to parse an example from https://www.researchobject.org/ro-crate/1.1/appendix/relative-uris.html#establishing-a-base-uri-inside-a-zip-file.

It appears to be caused by use of urllib.parse.urljoin which only supports a specific set of schemes. There is a documented workaround (https://bugs.python.org/issue18828#msg196794):

import urllib.parse
urllib.parse.uses_relative.append('<scheme>')
urllib.parse.uses_netloc.append('<scheme>')