Feature request: changing the default deserializer

[priyadi]

Right now the parser falls back to Sabre\Xml\Element\Base::xmlDeserialize if the element's name is not registered in $this->elementMap.

xml/lib/Reader.php

Line 286 in a6af111

return ['Sabre\\Xml\\Element\\Base', 'xmlDeserialize'];

I propose making this default configurable. With some XMLs, people extend them in a way that is impossible to know every vendor-specific variation out there. It would be nice if we can parse these elements into a generic class that fits with the rest of the resulting data structure.