View source for Activity Streams In Persona

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This document describes a use case that requires a few extensions to PDM 2.0 to add the missing Event class and associated attributes. We describe it here to explore how it could be modelled.<br> 

[[Image:Activity-streamsv2.png|center]] 

The Facebook context is provided by a web service that reads the Facebook activity streams. Shown above is a single Event that is "from" Joe-3, that is "to" a list of people and is "about" a party, Parity-3. Similarly the Twitter context parses the Twitter stream. In this second context the local name for what is in fact the same party as Party-1 has entityid Party-2. Above these two is a context provided by a Lookup Service. This service's function is to create correlations between events. Shown above, the Lookup Service knows that Party-1 in its namespace is the same as Twitter's Party-2 and Facebook's Party-3. <br> 

In the Meta context we see that the user knows a person named Joe-1 and also knows that Joe-1's Facebook handle is Joe-3 and his Twitter handle is Joe-2. 

=== Something cool that this model makes possible  ===

Imagine that the user, armed with an active client, has installed a Meetup app-card that performs web augmentation on Meetup.com. The Javascript scrapes the Meetup page and sees an event called "Party-4". It then performs a fairly complex query against the Personal Data Store (the contexts shown above). The intent of the query is to determine which friends of the user are planning to attend Party-4. The query first finds out that Party-1 is the more general identifier for Party-4. Then, starting at the MetaMe node attempts to find all friends of MetaMe (the user) that is attending Parity-1. The search determines that the user's friend Joe-1 is attending Party-1 by looking at the Event in the Facebook stream and seeing that Joe-3 is attending Party-3 which is correlated to Party-1. 

The Meetup app then overlays on the Meetup site a small picture of Joe beside the listing of Parity-4. Now that's cool.