With Yahoo Pipes, the Split Module receives an RSS feed and allows you to split it into two identical output feeds. This is useful if you want to perform different operations on the same feed.
The Union Module is the reverse of the Split Module, as it merges multiple feeds into one.
In this example, we’re going to take a Craigslist RSS feed for Canucks tickets in Vancouver, BC. We’re going to use the Split Module to show results with “Flames” in them, but block results with “Coyotes”.
First, we’ll grab our feed:
http://vancouver.en.craigslist.ca/search/tix?queryx3dcanucksx26catAbbreviationx3dtixx26formatx3drss
And plug it into the Fetch Feed Module and then into the Split Module:
This is what our feed currently looks like in the Yahoo Pipes Debugger pane:
Then we need to connect two Filter Modules to the Split Module:
In the first Filter Module, we’re going to “Permit all” “item.titles” that contain “Flames”.
In the second Filter Module, we’re going to “Block all” “item.titles” that contain “Coyotes”.
Now because we split our feed into two, we need to merge them back together as one, using the Union Module. Lets do that and take a look at the new feed in the Debugger pane:
Because we permitted them, there are still results with “Flames” in them, but there are no longer results with “Coyotes”, thanks in to the Split and Filter Modules.
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