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SearchLoader "is a developer package which allows third-party developers to add their own Spotlight search result categories" (SearchBundles) (quoted from its depiction).
It has the TL class prefix.
For more details, see SearchLoader [Archived 2014-06-25 at the Wayback Machine] and Hacking the iOS Spotlight, v2 [Archived 2014-06-25 at the Wayback Machine] on theiostream's blog.