How to interpret extended attributes on MacOS X?

I have a problem with rsync (version 2.6.9 which is outdated, but this is another problem) not correctly synchronizing files from MacOS X to MacOS X (versions Mountain Lion, Mavericks, Yosemite and that's all for now because my time to investigate is exhausted). I have been able to reduce this problem to files which have extended attributes. I would like to understand it (for example is it safe to suppress x or y extended attributes).

On Mac OS X, ls with the @l option combination displays extended attributes of any argument:

% ls -@dl example
dr-xr-xr-x@ 2 bob  wheel  102 Jul 18 17:21 example
        com.apple.FinderInfo     32 
%

The command xattr displays the content of these extended attributes:

% xattr -l example
com.apple.FinderInfo:
00000000  3F 3F 3F 3F 3F 3F 3F 3F 20 02 00 00 00 00 00 00  |???????? .......|
00000010  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
00000020
%

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How may I decode this information, in this particular case, and in a more general one?

What might have created this com.apple.FinderInfo extended attribute?

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