XML:
```xml
<persistence>
    <!-- use default configuration -->
    <phpcr />

    <!-- or setting it the straight way -->
    <phpcr>true</phpcr>

    <!-- or setting an option under 'phpcr' -->
    <phpcr manager="..." />
</persistence>
```

PHP:
````php
$container->loadFromExtension('cmf_simple_cms', array(
    // ...
    'persistence' => array(
        'phpcr' => null, // use default configuration
        // or
        'phpcr' => true, // straight way
        // or
        'phpcr' => array(
            'manager' => '...', // or any other option under 'phpcr'
        )
    ),
));
````