hi mariya,
I think SDN does not offer any services as webservices but they offer the RSS functionality in many places to enable retrieval of most content using sophisticated (granular) filtering.
Just click on the little RSS button below this thread and find a large page with different rss links and possiblities. look at one such link and see theresult being delivered in xml format. although aimed to be read by rss client sofwtare you're of course free to parse that (structured) content to your needs.
Other than that, I would suggest to post this in a more suitable forum, i.e.
regards,
anton
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