Restricting types

• param children of data specify the constraints on the type to create a subset of the normally accepted values

• For example, this data element restricts a date to be any year from 1877 (the year Edison invented the phonograph) on:

  <element name="YEAR">
    <data type="gYear">
      <param name="minInclusive">1877</param/>
    </data>
  </element>

• In the compact syntax:

  element YEAR {xsd:gYear {minInclusive = "1877"}}