OpenAPI definitions

JSON Schema Validation v04 has the following built-in formats for strings:

• "date-time": Date representation, as defined by RFC 3339, section 5.6.
• "email": Internet email address, see RFC 5322, section 3.4.1.
• "hostname": Internet host name, see RFC 1034, section 3.1.
• "ipv4": IPv4 address, according to dotted-quad ABNF syntax as defined in RFC 2673, section 3.2.
• "ipv6": IPv6 address, as defined in RFC 2373, section 2.2.
• "uri": A universal resource identifier (URI), according to RFC 3986.

Additionally, we use the following format identifiers:

• "line": A single line of text, ie. not including any new-line characters.
• "rst": reStructuredText
• "full-date": as defined by RFC 3339, section 5.6.