ide/xml.schema.completion/test/unit/src/org/netbeans/modules/xml/schema/completion/resources/AbstractElementParent.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema version="1.0" 
           xmlns="urn:parent"
           targetNamespace="urn:parent"
           xmlns:xs="http://www.w3.org/2001/XMLSchema" 
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.w3.org/2001/XMLSchema XMLSchema.xsd"
           elementFormDefault="qualified" xml:lang="EN">
               
    <xs:element name="parent" type="Parent"/>

    <xs:element name="child" abstract="true"/>

    <xs:complexType name="Parent">
        <xs:sequence>
            <xs:element ref="child" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="Child" abstract="true">
        <xs:attribute name="name" type="xs:string"/>
    </xs:complexType>
</xs:schema>