Is Apple's "Spotlight" Technology just WinFS in Tiger's Clothing?

Url: http://developer.apple.com/macosx/tiger/spotlig…
Since MacWorld, I’ve been delving through some of the public docs about “Spotlight”.  Metadata annotation of files, at OS level, integrated into system commands (e.g. ls).  Sounds a lot like WinFS, but maybe less heavy handed.  I wonder how it will perform.  It might be a good model for how the WinFS team look at the metadata/file problem instead of trying to embed SQL Server into the OS.