Robots.txt for multiple domains

Question

We have different domains for each language

1. www.abc.com
2. www.abc.se
3. www.abc.de

And then we have different sitemap.xml for each

Answer 1

The robots.txt can only inform the search engines of sitemaps for its own domain. So that one will be the only one it honors when it crawls that domain's robots.txt. If all three domains map to the same website and share a robots.txt then the search engines will effectively find each sitemap.