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The following example is a datatype definition for a user-derived datatype which limits the values of dates to the three US holidays 
enumerated. This datatype definition would appear in a schema authored by an 'end-user' and shows how to define a datatype by 
enumerating the values in its value space. The enumerated values must be type-valid literals for the base type.

<simpleType name='holidays'>

	<annotation>

		<documentation>some US holidays</documentation>

	</annotation>

	<restriction base='gMonthDay'>

		<enumeration value='--01-01'>

			<annotation>

				<documentation>New Year's day</documentation>

			</annotation>
		</enumeration>

		<enumeration value='--07-04'>

			<annotation>

				<documentation>4th of July</documentation>

			</annotation>
		</enumeration>
		<enumeration value='--12-25'>

			<annotation>
				<documentation>Christmas</documentation>

			</annotation>

		</enumeration>

	</restriction>
</simpleType>