A CURIE defines a generic abbreviated syntax for expressing Uniform Resource Identifiers (URIs). e.g. [company:012345], [public-body:cabinet-office]. Relative values link to the register identified in the entry for the field in the field register.
A combination of a date and a time in the format
CCYY-MM-DDThh:mm:ss[Z] as described in chapter 5.4 of ISO 8601. The value can be truncated to just the most significant digits, for example "2014-05". Time values, where present, should be in UTC.
A time interval as described in ISO 8601. The intervening time between two points can be described in four ways: start date and end date, start date and duration, duration and end date or duration only. A start date and end date must follow the datetime datatype and a duration must be formatted as described by ISO 8601.
A string of Unicode 6.2.x characters encoded as UTF-8.
A string of text which may contain Markdown formatting instructions.