URI schemes (and default paths) to access resources in Qt/QML applications?

For example, the SDK sample app uses image://theme/ to access theme icons. Are there similar paths to access icons shipped with the application itself, together with standard locations where these should actually be placed in the filesystem? (I don't know, something like image://app/ or whatever).
For example, I'm writing an application that ships with an .xml file, which I'm currently placing in %{_datadir} (i.e. /usr/share/appname/). Is this path available through some appropriate uri scheme in Qt/QML?