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Captions are a big problem with ePUB if you want to be absolutly sure that the caption is always combined with the picture. The only way to always be sure (AFAK), is to insert the caption in the picture itself.
You can include it in the SVG, but forget about centering automatically.
In ePUB3 it is supposedly solved IF (there it is again) the ePUB3 readers follow the specifications and interpret them the same.
As has been said many times. Don't make it too complex, because for sure it will break on a reader or reading program.
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