The #GtkSourceFile. The #GtkSourceFileLoader object has a weak reference to the file.
The #GInputStream to load. Useful for reading stdin. If this property is set, the #GtkSourceFileLoader:location property is ignored.
The #GFile to load. If the #GtkSourceFileLoader:input-stream is %NULL, by default the location is taken from the #GtkSourceFile at construction time.
The #GtkSourceBuffer to load the contents into. The #GtkSourceFileLoader object has a weak reference to the buffer.