Datatype register

Forms that the data in a register field can take

Datatype Phase Text
The format of the data held in a field. The stage of development a register is in. There are 4 phases - discovery, alpha, beta and live. More information about a record in a register.
curie beta A [CURIE](http://en.wikipedia.org/wiki/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.
datetime beta 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](http://en.wikipedia.org/wiki/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.
string beta A string of [Unicode 6.2.x](http://www.unicode.org/versions/Unicode6.2.0/) characters encoded as [UTF-8](http://en.wikipedia.org/wiki/UTF-8).
text beta A string of text which may contain [Markdown](http://en.wikipedia.org/wiki/Markdown) formatting instructions.
url beta A [URL](http://en.wikipedia.org/wiki/Uniform_resource_locator) reference to another resource on the Web.