Discuss TrackbackEntryExample here.
[ZhangYining RefactorOk] Again, this example is verbose, but from dicussions so far, it's one possibility.
<?xml version="1.0" encoding="UTF-8"?> <feed xmlns="http://purl.org/echo/" version="1.0" xml:lang="en-us"> <title>Simple Echo Feed</title> <entry> <title>Original entry</title> <content mode="xml">Yea!</content> <id>http://purl.og/e45</id> </entry> <entry> <id>http://foobar.org/12345</id> <related> <relationRole>http://purl.org/echo/trackback</relationRole> <relationHref>http://purl.org/e45</relationHref> <relationAuthor> <name>Foo Bar</name> <homepage>http://foobar.org/</homepage> <weblog>http://foobar.org/weblog/</weblog> <email>foo@bar.org</email> <relationAuthor> </related> <title>TrackBack Example</title> <content mode="xml">Ping!</content> </entry> </feed>