XML Schema Datatypes

XML Schema Datatypes is a W3C Recommendation (standard) defining built-in datatypes including
- primitive
  - string
  - boolean
  - decimal
  - float
  - double
  - duration (e.g. PT30M for 30 minutes)
  - dateTime (e.g. 2002-03-01T15:00:00Z)
  - time (e.g. 15:00:00Z)
  - date (e.g. 2002-03-01)
  - anyURI
  - ...
- derived
  - integer
  - long
  - int
  - short
  - byte
  - nonNegativeInteger
  - unsignedLong
  - unsignedInt
  - unsignedShort
  - unsignedByte
  - positiveInteger
  - ...
the date/time/duration types use the ISO 8601 standard

users can also derive their own types, including regular-expression patterns, e.g.


<simpleType name="ssn">
  <restriction base="string">
    <pattern value="[0-9]{3}-[0-9]{2}-[0-9]{4}"/>
  </restriction>
</simpleType>

library support is becoming available
- Oracle XML Schema Processor in the Oracle XML Developer's Kit
- Castor