This Script generates an Google Sitemap as described here: https://www.google.com/webmasters/sitemaps/docs/en/about.html
Features:
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- supports multilangual categories and products
- supports Search-Engine Safe URLs (osC default)
- could be accessed by http or command line
- writes to file or standard output
No support for more the 50.000 URLs at the moment. See
http://www.google.com/webmasters/sitemaps/docs/en/protocol.html#sitemapFileRequirements