Use
EMML statements to get information from sources and work with that information to produce the final data you are intersted in. See
Creating a Mashup Script with
EMML for information and links to the basic
EMML statements and techniques for mashups.
For more advanced mashup techniques, see
Advanced Mashup Techniques.
You can also update your mashup scripts once they are published (only the owner or
MashZone NextGen administrators may update a mashup). Change the script as needed and republish the script using the same credentials you originally used to publish it. Or see
Updating Mashup Scripts from the Command Line for instructions.