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<restriction base="name of the simpleType you are deriving from">
A derived type declared using the <restriction> declaration is a subset of its base type.
Facets control all simple types within XML Schemas.
A facet is a single property or trait of a <simpleType>.
For example, the built-in numeric type nonNegativeIntegerwas created by deriving from the built-in Integer type and setting the facet minInclusiveto zero.
There are 12 constraining facets, described in the following table:
Facet
minExclusive
minInclusive
maxExclusive
maxInclusive
totalDigits
fractionDigits
length
minLength
maxLength
enumeration
whiteSpace
pattern
Within a <restriction> declaration, you must specify the type you are restricting using the base attribute.
The base attribute is a reference to a global <simpleType> definition or built-in XML Schema datatype.
<attribute name="kind">
<simpleType>
<restriction base="string">
<enumeration value="Home" />
<enumeration value="Work" />
<enumeration value="Cell" />
<enumeration value="Fax" />
</restriction>
</simpleType>
</attribute>
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