I have created a spotlight importer for comic files. The attributes are successfully imported and searchable. The one thing that remains is getting the attributes to display in a file's get info window.

It seems that this should be a simple matter of editing the schema.xml file so the attributes are nested inside displayattrs tags. Unfortunately this does not seem to be working.

I simplified the plugin for testing. The following are all of the important files.

schema.xml

<types>
<type name="cx.c3.cbz-archive">  
    <allattrs>
        kMDItemTitle
        kMDItemAuthors
    </allattrs>
    <displayattrs>
        kMDItemTitle
        kMDItemAuthors
    </displayattrs>
    </type>
<type name="cx.c3.cbr-archive">  
    <allattrs>
        kMDItemTitle
        kMDItemAuthors
        </allattrs>
    <displayattrs>
        kMDItemTitle
        kMDItemAuthors
    </displayattrs>
</type>

GetMetadataForFile.m

Boolean GetMetadataForFile(void* thisInterface, 
                       CFMutableDictionaryRef attributes, 
                       CFStringRef contentTypeUTI,
                       CFStringRef pathToFile)
{
    NSAutoreleasePool * pool = [NSAutoreleasePool new];
    NSString * file = (NSString *)pathToFile;
    NSArray * authors = [[UKXattrMetadataStore stringForKey: @"com_opencomics_authors" atPath: file traverseLink: NO] componentsSeparatedByString: @","];
    [(NSMutableDictionary *)attributes setObject: authors forKey: (id)kMDItemAuthors];
    NSString * title = [UKXattrMetadataStore stringForKey: @"com_opencomics_title" atPath: file traverseLink: NO];
    [(NSMutableDictionary *)attributes setObject: title forKey: (id)kMDItemTitle];
    [pool release];
    return true;
}