- (BOOL)importData {
  NSString *filePath = [[NSBundle mainBundle] pathForResource:@"dl" ofType:@"xml"];
  NSURL *localfile = [[NSURL alloc] initFileURLWithPath:filePath];
  [self mergeDataFromExternalSource:localfile];
  return TRUE;
}

- (BOOL)mergeDataFromExternalSource:(NSURL *)source {
  // Read in property list
  NSPropertyListFormat *format;
  NSString *errorDesc;
  NSData *plistXML = [[NSData alloc] initWithContentsOfURL:source];

  // Get entire XML file into an NSDictionary object which is ideal for plist data
  NSDictionary *data = (NSDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML
                 mutabilityOption:NSPropertyListImmutable format:format errorDescription:&errorDesc];

  // Use NSMutableSet as we are parsing the plist and we only want one instance of each category
  // A set does that for us unlike an array.
  NSMutableSet *scategories = [[NSMutableSet alloc] init];

  // Get all category names into mutable array
  for(id object in data) {
    for(id key in object) {
      if([key isEqualToString:@"type"])
        [scategories addObject:(NSString *)[object objectForKey:key]];
    }
  }

  // However we cannot sort sets so we now change it into an array anyway
  NSMutableArray *categories = [[NSMutableArray alloc] initWithSet:scategories];
  [scategories release];
  [categories sortUsingSelector:@selector(compare:)];

  // Create fetch request to get all category names
  NSFetchRequest *categoriesRequest = [[[NSFetchRequest alloc] init] autorelease];
  [categoriesRequest setEntity:[NSEntityDescription entityForName:@"Category" inManagedObjectContext:managedObjectContext_]];
  // Only fetch records that exist in our input data
  [categoriesRequest setPredicate:[NSPredicate predicateWithFormat:@"(name in %@)",categories]];

  // Sort our data store categories too so they match our input data.
  [categoriesRequest setSortDescriptors:[NSArray arrayWithObject:[[[NSSortDescriptor alloc]
                         initWithKey:@"name" ascending:YES] autorelease]]];

  // Execute fetch
  NSError *error;
  NSArray *categoriesMatchingNames = [managedObjectContext_ executeFetchRequest:categoriesRequest error:&error];

  // We need to enumarate the categoriesMatchingNames array as we must control when next to fetch an object
  // We only want to fetch the next object when it matches a category as we have n input categories but potential n-x
  // stored ones.
  NSEnumerator *enumurateDSCategories = [categoriesMatchingNames objectEnumerator];

  // Get an initial category
  Category *dsCategory = (Category *)[enumateDSCategories nextObject];
  // Get the names to parse
  for(NSString *type in categories) {
    // If the data store category is blank (we had none or run out) or they don't match add it.
    if( (dsCategory == nil) || ![type isEqualToString:[dsCategory name]] ) {
      Category *category = (Category *)[NSEntityDescription insertNewObjectForEntityForName:@"Category" inManagedObjectContext:managedObjectContext_];
      [category setName:type];
    }
    // If the data store category matches the input one get the next data store category
    if( [type isEqualToString:[dsCategory name]] ) {
      Category *dsCategory = (Category *)[enumurateDSCategories nextObject];
    }
  }

  if(![managedObjectContext_ save:&error])
  {
   NSLog(@"Core data failed to save new objects!");
  }

  [categories release];
  [plistXML release];

  return TRUE;
}