Merging XML Files With Groovy

I needed to generate an XML file from database tables and the plan was to use Talend Open Studio. Talend is an ETL tool that generates data integration jobs in Java. The community edition is free and I’d been using it for several other data tasks for an ecommerce client. Overall, I think it’s quicker than hand-coding in Java, but you can still dip into Java code if you need to and embed the jobs in other programs.

Unfortunately, it’s not so good when it comes to generating moderately complex XML files. By moderately complex, I mean lists of lists like this: