Kate, Thanks for emailing the group! I do agree Sitemaps would be an amazing thing to add.
The diffing mechanism you describe can be implemented by the hub itself (in any way that makes sense for it). I believe just keeping track of the <loc> elements would be enough? Also, have you looked at spec 0.4 https://superfeedr-misc.s3.amazonaws.com/pubsubhubbub-core-0.4.html I don't see any reason which would prevent from using this! Julien On Thu, May 24, 2012 at 10:52 AM, Kate Volkova <[email protected]> wrote: > Hello PubSubHubbub developers and users! > > We would like to add PubSubHubbub support for > Sitemaps<http://www.sitemaps.org/> to > make it even more similar to Atom and RSS feeds. > > A Sitemap <http://www.sitemaps.org/> is an XML file that lists several > entries each in its own <url> tag. Each entry has a URL associated with > it (under <loc> tag), which can be used as an entry id. Each entry may also > contain additional metadata about the URL (when it was last updated, how > often it usually changes, etc.). Here is an example of a Sitemap from > http://www.sitemaps.org/: > > <?xml version="1.0" encoding="UTF-8"?> > > <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9";> > > <url> > > <loc>http://www.example.com/</loc> > > <lastmod>2005-01-01</lastmod> > > <changefreq>monthly</changefreq> > > <priority>0.8</priority> > > </url> > > <url> > > > <loc>http://www.example.com/catalog?item=12&desc=vacation_hawaii<http://www.example.com/catalog?item=12&desc=vacation_hawaii> > </loc> > > <changefreq>weekly</changefreq> > > </url> > > </urlset> > > > The same Sitemap with PubSubHubbub support would look like this: > > <?xml version="1.0" encoding="UTF-8"?> > > <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"* ** > xmlns:atom="http://www.w3.org/2005/Atom*";> > > *<atom:link rel="hub" href="**http://myhub.example.com/endpoint"/>* > > <url> > > <loc>http://www.example.com/</loc> > > <lastmod>2005-01-01</lastmod> > > <changefreq>monthly</changefreq> > > <priority>0.8</priority> > > </url> > > <url> > > > <loc>http://www.example.com/catalog?item=12&desc=vacation_hawaii<http://www.example.com/catalog?item=12&desc=vacation_hawaii> > </loc> > > <changefreq>weekly</changefreq> > > </url> > > </urlset> > > > Diffs between previous and current version of the feed will be computed > the same way as it’s done for Atom and RSS feeds: > > - For each entry sha1(entry) is computed and compared with the old hash > value for the same entry_id. > - If the hash value has changed or there is no old hash value for this > entry_id (an entry is new), the entry is added to the list of items to > publish for this topic (feed_url) > > Any comments on this? > > Thanks! > > -- > Kate Volkova, > Software Engineer, Google. >
