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here is the document about google image sitemap, But <image:caption> and <image:title>, which is more important? if i have only one description of this image, which part is better to be put in? I mean put the description in <image:caption>, leave <image:title> is blank, or put the description in <image:title>, leave <image:caption> is blank.

Another question, if I store image in a third part image cloud server(the image domain is not my main site domain), is it matter to make a google image sitemap? such as:

<?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
      a pretty car
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You should try to limit questions to a single fairly contained topic. There's no functional difference between you adding "just one more question" and adding ten more. I'd suggest splitting the cross-domain question into a separate posting. I have a feeling that question's been asked already, incidentally; you might search a bit. –  Su' May 28 '12 at 21:53

1 Answer 1

up vote 2 down vote accepted

Those tags are entirely different–and fairly self-explanatory–things. The difference between them isn't really importance, but purpose. Your descriptions will fit best in the image:caption element. Reserve image:title for if/when you have actual titles, such as a named piece of artwork. Some images don't have titles at all, and that's fine; it's why the element is optional. That's not a reason to cram an entirely different kind of data into it.

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