THE XML REVOLUTION - TECHNOLOGIES FOR THE FUTURE WEB

Constructing simple types

Simple types can be:

primitive (hardwired meaning)
derived from existing simple types:
- by a list: white-space separated sequence of other simple types
- by a union: union of other simple types
- by a restriction:
  - length, minLength, maxLength (list lengths)
  - enumeration (intersection with list of values)
  - pattern (intersection with Perl-like regexp)
  - whiteSpace (preserve/replace/collapse white-space)
  - minInclusive, maxInclusive (bounds on numbers)

A lot of often-used simple types (all the primitive and some derived) are predefined:

In addition, white space normalization of attribute values and chardata can be controlled at the simple-type definitions.

Example definition of a derived simple type:

All this is specified in Part 2 of the spec.