Subsonic: Build XML using DOMDocument instead of SimpleXMLElement
Subsonic: Build XML using DOMDocument instead of SimpleXMLElement

The DOMDocument API makes better work in sanitazing content whics is not
legal within XML elements.

owncloud/music,paulijar/music,owncloud/music,paulijar/music,owncloud/music,paulijar/music,owncloud/music,paulijar/music,paulijar/music,owncloud/music