Page Comparison

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<field type="..." variable="...">
    <spec>
        ...
        <processor class="fully.qualified.ProcessorClassName" [backupVariable="..."]>
            <configuration>
                <param name="whatever-param-name" value="..."/>
                <param name="another-param2-name" value="..."/>
                ...
            </configuration>
        </processor>
    </spec>
    <validator class="fully.qualified.ValidatorClassName" txt="..." id="..."/>
</field>

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