When import this package into your asset tree, you can visit http://www.example.com/config.xml to get the google sitemap config.xml file, then you can use the tool from google to generate the sitemap.xml.gz for google sitemap.
The command is:
#wget http://www.example.com/config.xml
#sitemap_gen.py --config=config.xml
You mast change the <site base_url="http://www.example.com" ... > and <url href="http://www.example.com ...> to fit your site need.
Chinese user can see here for details:
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http://www.webgui.cn/webgui/applications/app-list/webgui-google-sitemap