Holds attempts to construct a working SCIM ABNF parser based on abnf_parsec
and the ABNF definitions found in:
- https://www.rfc-editor.org/rfc/rfc7644#section-4 ABNF
- https://www.rfc-editor.org/rfc/rfc7644#page-34 path ABNF
- https://www.rfc-editor.org/rfc/rfc3986#appendix-A URI ABNF
- https://www.rfc-editor.org/rfc/rfc5234#appendix-B.1 core ABNF
- https://trac.ietf.org/trac/json/browser/abnf/json.abnf?rev=2 json ABNF