iCloud: How to read in directories created by the user - iphone

Question

I would like to read in a list of all directories that are created either by the user or the app in iCloud's Mobile Documents directory (the one found in Lion under ~/Library/Mobile Documents). Here is an example of how this directory could look like:
I tried the following code, but the query I run will not contain any objects representing my folders (using the NSPredicate predicateWithFormat:#"%K.pathExtension = ''", NSMetadataItemFSNameKey). If I run a query for txt files (using #"%K ENDSWITH '.txt'", NSMetadataItemFSNameKey), I will get 5 objects returned for the txt files respectively. Looking for txt files thus works, but not for directories. Reading through the docs, I noticed that Apple suggests to use NSFileWrapper (File Packages) instead of directories. Is iCloud not able to handle/detect directories created by the user or the app?
Here is my code:
-(void)loadDocument {
NSMetadataQuery *query = [[NSMetadataQuery alloc] init];
_query = query;
//Search all files in the Documents directories of the application’s iCloud container directories:
[query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];
NSPredicate *pred = [NSPredicate predicateWithFormat:#"%K.pathExtension = ''", NSMetadataItemFSNameKey];
[query setPredicate:pred];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(queryDidFinishGathering:) name:NSMetadataQueryDidFinishGatheringNotification object:query];
[query startQuery];
}
- (void)queryDidFinishGathering:(NSNotification *)notification {
NSMetadataQuery *query = [notification object];
[query disableUpdates]; // You should invoke this method before iterating over query results that could change due to live updates.
[query stopQuery]; // You would call this function to stop a query that is generating too many results to be useful but still want to access the available results.
[self loadData:query];
[[NSNotificationCenter defaultCenter] removeObserver:self name:NSMetadataQueryDidFinishGatheringNotification object:query];
_query = nil; // we're done with it
}
- (void)loadData:(NSMetadataQuery *)query {
NSLog(#"Query count %i", [query resultCount]);
for (int i=0; i < [query resultCount]; i++) {
NSMetadataItem *item = [query resultAtIndex:i];
NSURL *url = [item valueForAttribute:NSMetadataItemURLKey];
NSLog(#"%i.URL: %#", i, url);
}
}

Answer 1

I had a look at "Manage Storage" in the iClouds Settings in Mac OS X Lion. When I click my application, it will only show the different txt files (plus conflicting versions) and no directories whatsoever. So I have to assume that you can only work with wrappers / file packages but not with directories.