interoperated with the verifiable credential specification; added new rationale
changed member to subject, memberAttestationsURI to subjectAttestationsURI to make the schema more widely applicable / analogous to verifiable credentials
changed issuerURI to just issuer, since issuerURI is effectively "issuer" in the VC specification
changed expiration to expirationDate, following the VC specification
adjusted the "id" to conform to the VC specification, though we've retained a "type" field in the credentialSubject object
changed attestationIssuer field to attestationIssuerURI field; added new schema for attestationIssuerURI
changed capitalization of all types to TypeName from typeName to match schema.org examples
created a new generic Attestation type, added issuerURI and attestationURI to it
added a new schema for attestation types (moved over from regulatory interop), and removed extensions section
added a new schema for contributions
added apiURI to support OpenAPI interop
added a signature section
added a use-case for publishing daoURI as an attestation through a service such as EAS