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However this is not supported by the current implementation of XmlResponseFormatter because values are always appended as DOMText. This means that, even is I pass a PHP null value, I get `<elem></elem>`.
Therefore, I have extended XmlResponse Formatter as follows.
Firstly, the function format() must be modified because creating $root as DOMElement makes it immutable while I need to attach the xsi: namespace definition. Therefore I use:
```php[...]
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