
The concept of the APML standard is that it allows you to share your data with an “attention profile” (your tastes and interests) with other users, organizations or applications, just as you could share your OPML file with someone.
At the moment, there are a large number of applications that already use the
APML standard, but the data is exported manually, like
OPML . One of these is the
NewsGator RSS reader. Having added this function, access to your “attention profile” can now be obtained using one single individual and permanent URL, and separately for each data channel.
Data integration has been simplified, and a mechanism is provided by which you can extend the capabilities of third-party applications that can use the
NewsGator API to synchronize the service within their tasks. The user can open or close data for viewing in other applications.

In fact, this is a big step forward in an attempt to monetize services using targeting, but using data from the “economy of attention”.
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via
The Social Trend