Since I cannot comment on the page itself I'll do it here :)
1. <link rel="activitystream" type="application/atom+xml"
href="
http://www.example.com/xml/index.atom" />
This is straightforward but rather worthless too since you can't
decide what's the context is.
2. <link rel="alternate activitystream" type="application/atom+xml"
href="
http://www.example.com/xml/index.atom" />
I doubt this is actually valid since rel attribute can't have a space
in their value (well if the link element comes from the Atom
namespace, the HTML4 allows it).
3. <link rel="alternate" type="application/atom+xml"
href="
http://www.example.com/xml/index.atom" class="activitystream" />
The class attribute should be namespaced here. This isn't a good idea
IMO nonetheless since you can't have more than one rel="alternate" per
entry with a given couple of type and hreflang (again if link comes
from the Atom namespace).
I would venture for this instead:
<link rel="activitystream" type="application/atom+xml"
href="
http://www.example.com/xml/index.atom">
<activity:object-type>
http://activitystrea.ms/schema/1.0/photo</activity:object-type>
</link>
- Sylvain
2009/5/12 Chris Messina <
chris....@gmail.com>: