XmlSchema/src/test/test-resources/external/externalElementAnnotations.xsd

<schema
        xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:xsd="http://www.w3.org/2001/XMLSchema"
        xmlns:tns="http://soapinterop.org/types"
        xmlns:ext="http://customattrib.org"
        targetNamespace="http://soapinterop.org/types">

    <complexType name="Struct">
        <ext:customElt prefix="ext" suffix="type"/>
        <sequence>
            <element name="varString" type="xsd:string"/>
            <element name="varInt" type="xsd:int" />
            <element name="varFloat" type="xsd:float" />
            <element name="varStruct" type="tns:Struct" />
        </sequence>
    </complexType>

    <element name="attrTest" type="tns:Struct" >
        <ext:customElt prefix="ext" suffix="elt"/>
    </element>

</schema>