string

ECMAScipt string

number

ECMAScipt number

boolean

ECMAScipt boolean

array

ECMAScipt array, e.g. 1, 1, 2, 3, 5, 8. The element type/s are not specified when the generic "array" type is used.

object *

ECMAScipt object, e.g. { foo: "bar", baz: "boo" }. The specifics of the object are not specified when the generic "object" type is used.

null *

ECMAScipt null

Any CSS length value

color *

Any CSS color value

id

ID value - probably not useful for OpenSocial Gadgets, but might as well keep the two specs in sync

class *

zero of more CSS class names, separated by spaces

style *

a string that could be used as value for a 'style' attribute

url

A URL

html

A fragment of HTML markup.

countrycode *

A string that represents an A3 ISO 3166 country code.

languagecode *

A string that represents an ISO 639-2 language code.

email

A string that represents an e-mail address.

person

A string that holds a person's name.

postalcode

A string that represents a postal code.

phone

A string that represents a phone number.

date *

A string that represents a date. MUST be expressed using the "Date Time String Format" defined in the ECMAScript5 specification using one of the date-only forms. For example: "2009-12-15"

time *

A string that represents a time of day. MUST be expressed using the "Date Time String Format" defined in the ECMAScript5 specification using one of the time-only forms. For example: "18:45:00Z" or "10:26:24-05:00"

timestamp *

A string that represents a date and time of day. MUST be expressed using the "Date Time String Format" defined in the ECMAScript5 specification. For example: "2009-12-15:18:45.000Z"

duration *

A string that represents a duration. MUST have format "PYYYY-DDDThh:mm:ss.fff". For example, "P0400-152T20:45:33.123" means "400 years, 152 days, 20 hours, 45 minutes, 33.123 seconds, while "P0003-000T01:56:22.000" means "3 years, 1 hour, 56 minutes and 22.000 seconds." (Must use this one variant defined in the ISO 8601 standard).

Asterisk, or missing type attribute, means "any datatype"

...