At times we need some test data to play with. Sometimes for a quick proof of concept, sometimes because we don't have access to production system data.
On top some reference fields are created. They can also reference each other. Like the id "quarter" reference the id "date1". And then further below the references are used to generate data. The fields of type "category" use word lists. Further below there is also a field of type "regex". This is a regular expression and the data generator will generate data according to it. And at the end there is a field of type "random" which generates purely random data.
I loaded the generated data into OpenOffice Calc. You can see that column E of the spreadsheet contains the date, column F contains the year of the date, column G the quarter, column H the month and column I the day of month. Column J contains the regular expression data: a number of minimum length 4 and of maximum length 7 - according to the xml definition file. I believe you will get the rest yourself.