Lab 10: Store each Juicer in a Separate File

Iterate through each juicer in juicers.xml and store
each juicer into a different file. 

Here's how to name each file: on each juicer element is
an id attribute. Use the value of the id attribute as the
filename, with .xml as the file extension:


   concat(juicer/@id, '.xml')


Name your pipeline file: foreach-juicer.xpl

Run it.

A bunch of new files should appear on your machine, one for
each juicer.

See lab10-pipeline.gif for an image of the pipeline you are to create.
(open the gif image in a browser)

