Currently a "feed" is strongly associated with a "site" or with specific "category" or "sections" of sites (where a "section" could be like b-links, photoblog, play list, while "categories" are more like keywords).
This page explores the idea of separating the protocol aspects of a "feed" from the logical relationship to its entries, particularly, it provides an alternate mechanism for relating an entry to its "source" (a la PaceEntryOrigin).
Current feed:
<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://example.com/newformat#">
<title>Kitty Adventures.</title>
<id>tag:example.com,2004:kitties</id>
<link rel="alternate" type="text/html" href="http://example.com/kitties/"/>
<author>
<name>Kitty Owner</name>
</author>
<modified>2003-06-07T09:30:00+02:00</modified>
<entry>
<title>Russian Blue</title>
<id>tag:example.com,2004:kitties/russian-blue</id>
<link rel="alternate" type="text/html" href="http://example.com/kitties/russian-blue.html"/>
<issued>2003-06-07T09:30:00+02:00</issued>
<modified>2003-06-07T09:30:00+02:00</modified>
<content src="http://example.com/kitties/russian-blue.jpg">
</entry>
</feed>
A "protocol instance" of a "feed" with its information refactored to be separate from the physical feed:
<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://example.com/newformat#">
<modified>2003-06-07T09:30:00+02:00</modified>
<site>
<title>Kitty Adventures.</title>
<id>tag:example.com,2004:kitties</id>
<link rel="alternate" type="text/html" href="http://example.com/kitties/"/>
<author ref="tag:example.com,2004:authors/kitty"/>
</site>
<author>
<id>tag:example.com,2004:authors/kitty</id>
<name>Kitty Owner</name>
</author>
<entry>
<title>Russian Blue</title>
<id>tag:example.com,2004:kitties/russian-blue</id>
<origin ref="tag:example.com,2004:kitties"/>
<link rel="alternate" type="text/html" href="http://example.com/kitties/russian-blue.html"/>
<issued>2003-06-07T09:30:00+02:00</issued>
<modified>2003-06-07T09:30:00+02:00</modified>
<author ref="tag:example.com,2004:authors/kitty"/>
<content src="http://example.com/kitties/russian-blue.jpg">
</entry>
</feed>
