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Some primitive value besides a conrete data-type may have a
predefined set of values. And the value can be set only to one
of that variants, like enumerations.
XML schema allows us to restrict the value of a given type by
a set of enumerated values. From the other hand we can restrict
some value by defining its min/max bounds:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="purchase-order">
...
////////////// order number should be an integer in range (0;1000):
<xs:attribute name="number" use="required">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:maxExclusive value="1000"/>
<xs:minExclusive value="0"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:element name="item" maxOccurs="unbounded">
...
////////////// our item-type may be either CD or DVD:
<xs:attribute name="type">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="CD"/>
<xs:enumeration value="DVD"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
...
</xs:complexType>
...
</xs:element>
...
</xs:element>
</xs:schema>
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