attribute with referencing xlink
File: Data.xml
<?xml version="1.0"?>
<Mission xmlns="http://www.java2s.com/unit/mission"
xmlns:xlink="http://www.w3.org/1999/xlink/namespace"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://www.java2s.com/unit/mission
Schema.xsd">
<MISSION-DATA>...</MISSION-DATA>
<Sortie xlink:href="https://www.java2s.com/"/>
</Mission>
File: Schema.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2s.com/unit/mission"
xmlns="http://www.java2s.com/unit/mission"
xmlns:xlink="http://www.w3.org/1999/xlink/namespace"
elementFormDefault="qualified">
<xsd:import namespace="http://www.w3.org/1999/xlink/namespace"
schemaLocation="xlink.xsd"/>
<xsd:element name="Mission">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="MISSION-DATA" type="xsd:string"/>
<xsd:element name="Sortie" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence/>
<xsd:attribute ref="xlink:href" use="required"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
File: xlink.xsd
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3.org/1999/xlink/namespace"
xmlns="http://www.w3.org/1999/xlink/namespace"
elementFormDefault="qualified">
<xsd:attribute name="href" type="xsd:anyURI"/>
</xsd:schema>
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