To view the site defenition (onet.xml) which was used to create the sharepoint site, you could do by using RPC.
Append /_vti_bin/owssvr.dll?Cmd=GetProjSchema to the end of the url of your site to get it.
Example: http://myserver/sites/mysites/_vti_bin/owssvr.dll?Cmd=GetProjSchema
