If you're just going to use a type once, you can omit the cross reference between the element and the type.
The only difference between an anonymous type and a named type is that a named type can be used more than once.
whereas the anonymous type can only be used for the element in which it is contained.
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2java.com" xmlns="http://www.java2java.com"
elementFormDefault="qualified">
<xsd:element name="zipcode">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:pattern value="\d{5}(-\d{4})?" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
</xsd:schema>
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