This example reads a feed and passes it through a Content Analysis module. This module tries to extract a few of the most meaningful words from the feed, adding those words in a new item element called y:content_analysis.
We pipe the resulting feed into a For Each: Annotate module. Inside this module we've embedded a Yahoo! Search source module. The Yahoo! Search module can search the internet for web pages that match search terms we provide. In our case, those search terms will come from the y:content_analysis element of each item in our first feed.
We configure For Each: Annotate to add a new element to each item from the first feed - we name that new element see_also. We select the item.y:content_analysis element as the "Search For" value inside Yahoo! Search, and we enter http://en.wikipedia.org as the site restriction option.
What this gives us is a final feed where every news article from the first feed is annotated with a cross-reference to a related article on Wikipedia.
Pipe Web Address: http://pipes.yahoo.com/pipes_team/bOCdiONS3BGWNTDnODY80A