RSS - Consumer Indegestion

As well as problems generating my own RSS feeds, I've been banging my head against the Adobe brick wall as far as consuming RSS is concerned.

Dreamweaver8 is my weapon of choice for development (so shoot me), and I tried a few months ago to get the BBC's Rugby Union RSS feed added to my rugbypix.com page. Adobe have a tutorial which explains a lot. Trouble was, I did everything they said, and on my localhost test environment, I kept getting an error message:

MM_XSLTransform error:
"http://newsrss.bbc.co.uk/rss/sportonline_uk_edition/rugby_union/rss.xml" is not a valid XML document.
The underlying connection was closed: Unable to connect to the remote server.

The claim that it wasn't a valid XML document was obviously rubbish, since the BBC's feed works in all the feed readers I've tried! Googling for the error didn't produce anything sensible, so I shelved the project and put it on the back burner for a while.

Returning to it this afternoon, I tried uploading the XSL fragment (which does the data repeat for the feed) and the page in which the transformation is called, onto my live server. I got a different message - the MM_XSLTransform.cs file was missing - progress! I knew that on my previous attempts, the only transform I could find available was the MM_XSLTransform.vb file, which was the wrong server model for my site.

Another quick google for the C# transform got me to this page. And, voilà! a link to download the missing MM_XSLTransform.cs. Bung it in the includes/MM_XSLTransform/ folder and upload it to the site, and Bob's your uncle... BBC Sport Rugby Union feed at rugbypix.com

Great, another niggling problem ticked off my list!

Playpen #5 - Well Fed

Generating RSS
I've been meaning to get some rss feeds sorted out for my photographic sites for some time. There were some technicalities which I was wracking my brains to overcome, and for a while, I couldn't make up my mind which format to support. But in the end, it only took a couple of dollars to pull my finger out - I found a great tutorial at CommunityMX about blog authoring, which gave me the final push.

I also found the rss2.0 specification and feed validator for Atom and RSS invaluable in getting a valid feed sorted out.

Where Are My Feeds?

• http://www.cazphoto.co.uk/rss/
  is the feed for my general photography
  
• http://www.rugbypix.com/rss/
  is the feed for my rugby photography

Feed Reader Interpretations
One thing I'd not really taken much notice of, as a consumer of other people's feeds, was how various feed readers actually present the information. But once I started authoring feeds, it's become a bit more obvious how each aggregator parses the xml file to display the feed. Some will only show 20 posts (no matter how many are actually in the feed), others keep a cached copy and don't seem to want to update the feed if the order of posts hasn't changed but the layout and content has. All rather frustrating if you're trying to author a feed and test it!

Some Anomalies
First off, Bloglines keeps a cache of the feed, and so it's only showing an early version of the rugbypix feed (without thumbnails) in this screenshot:

Also, if a feed has 40 items (I sometimes post a large batch of images so didn't want to limit the feed to the last dozen or so), it only shows 20 - the oldest 20. So when other feed readers show the last two matches (40 images = 2 games, 20 images each), Bloglines will only display the last but one game's pictures, not the latest 20. [Add: between composing this and actually posting it, Bloglines has now caught up and refreshed the feed - but it did take about 48 hours!]

The cazphoto feed looks a little better (I'd got the hang of formatting by now):

Next we see what it looks like in YahooMail Beta feed reader:

Quite a nice presentation, but it doesn't show the date up very well.

Google's feed reader makes a nice job of things in expanded view:

Plus it offers a cutdown list view if you so wish:

I also tried the Sage plugin for Firefox, which gives yet another take on the display, showing a 3-pane affair, feeds at top left, item summary of feed in bottom left and a rather more snazzily-laid out view of each item in the right pane:


So there we have it - a small sampling of feed readers. What's your favourite feed reader, and how well does it render your chosen feeds? One final (surprising) thing I found out during my investigations was that the standard Flickr Photo Feeds don't validate! Oops!

Publicising Your Feed
It's no good having a feed and no-one knows it's there. Adding a suitable link (often showing the icon) to your website can help. Also, add a link in the head of your page to tell feed readers your feed is available. This takes the format:

<link rel="alternate" type="application/rss+xml" title="My Feed " href="http://www.mysite.com/rss/">

Third Party services such as pingomatic can also help raise the profile of your feed. Happy pinging.

Atom Or RSS?

I'm thinking of providing XML feeds from my two photographic websites, cazphoto.co.uk and rugbypix.com. I have a clean sheet, and could either use the Atom standard or RSS. So which is best? Are there any significant differences? I've heard rumours that Atom is somehow "better" but RSS is more widespread. It's the old VHS vs Betamax chestnut rearing its head again! And I don't really want to be on the wrong end of the seesaw in the future.

I suppose I could take the line that, if it's good enough for the BBC, it's good enough for me, and go with RSS. Although plenty of sites such as Blogger provide their feeds as Atom.

Do any of you have a choice over which format you use? And if so, which one did you plump for and why? I'd be interested to hear your thoughts