Hi, I'm trying to understand the structure of url's of resource request in the RESTful API Specification.

From the following three example: /people/{guid}/@all -- Collection of all people connected to user {guid} /people/{guid}/@friends -- Collection of all friends of user {guid}; subset of @all /people/{guid}/{groupid} -- Collection of all people connected to user {guid} in group {groupid}

I understand that the structure is [resourceType]/[Unique Identifier]/ [Criteria] But the fourth example is not clear for me: /people/{guid}/@all/{pid} -- Individual person record for a specific person known to {guid}; shows {guid}'s view of {pid}.

what is the different between "/people/{guid}/@all/{pid}" and "/ people/{pid}/@self"? when should I use "/people/{guid}/@all/{pid}"?

Cheers