Re: Re: FYI: Feed History extension

Mark Nottingham <[email protected]> wrote:

> The extension has been updated:
>   http://purl.org/syndication/history/1.0
> 
> It now has a namespace URI; I'd love to hear about any implementation
> experiences.

I implemented [1] this a little while ago (pre-namespace).  Since then
I've been away for a while, which is the reason for my delay in
commenting on this.  

[Background information:  My feeds are ordered, paged lists of products
currently on sale, possibly restricted by search criteria.  They're
always dynamically generated.  When ordered by onsale date (the
default), my feeds can be considered stateful, so I set
<fh:stateful>true</fh:stateful> in that case.]

Given the url to my 'subscription document' a client can fetch entries
for all products currently on sale by going back through the prev links.
So it's useful for me to implement 'feed history'.  But there are two
properties of my feeds that make it slightly unusual. 

- My 'subscription documents' and 'archive documents' are all sliding
  windows.  So the first 'archive document' always has the same url, but
  its contents will change with time.  (It has a &page_no=2 cgi input.)

- I only ever return products that are still on sale.  That means that
  no matter how far back through the feed history a client goes there
  are some old entries it will never see again.


More concisely, there are four properties that feed-history feeds would
normally have.  My feeds only have the first two:

- relative order of entries does not change with time
- entries ordered by date
- contents of arhive documents urls does not change
- entries are never removed


The other issue I have is the meaning of the concept 'stateful'.  I am
having difficulty separating it from the concept of feed whose entries
are ordered by date.  Can you give me an example of a stateful feed
whose entries are not ordered by date?

Regards,

Peter

[1] <http://www.ticketswitch.com/cgi-bin/atom_feed.exe>





 
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