How to find RSS from website in iphone [closed]

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I am trying to a web page and find the RSS from the website. Can anybody suggest how I would go about finding the RSS for a website programmatically?

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I would use XPAth and parse the HTML. To find rss+xml use XPath expression //link[@type=\"application/rss+xml\"]/@href and to find atom+xml use //link[@type=\"application/atom+xml\"]/@href

Something like the code snippet below which uses the lib2xml parser and a wrapper I've built based on hpple wrapper. But you can use it for some pseudocode ideas. It returns an array of feed urls as NSURL's. This code also assumes you have the HTML you wish to search in a NSData structure.

-(NSArray *)getRSSFeedsUrlFromData:(NSData *)data {
    NSMutableArray *rssFeeds = [[[NSMutableArray alloc] init] autorelease];  
    Document *doc = [[Document alloc] initWithHTMLData:data];

    //rss+xml
    NSString *kXPathQuery1 = @"//link[@type=\"application/rss+xml\"]/@href";
    NSArray *elements1 = [doc search:kXPathQuery1];
    for  (DocumentElement *element in elements1) {
        [rssFeeds addObject:[NSURL URLWithString:[element content]]];
    }

    //atom+xml
    NSString *kXPathQuery3 = @"//link[@type=\"application/atom+xml\"]/@href";
    NSArray *elements3 = [doc search:kXPathQuery3];
    for  (DocumentElement *element in elements3) {
        [rssFeeds addObject:[NSURL URLWithString:[element content]]];
    }

    [doc release];
    return rssFeeds;
}