This page generates the XML to define Pie Charts in the Oracle BI Publisher Desktop Template Builder.
The Chart Wizard is fine a starting point for creating charts but lacks many features required to make basic customisations.
There is almost no decent documentation available for tweaking the XML and is something of a black art.
This XML generator is intended to give you a quick and easy way of creating customised Pie Charts.
If you need some quick test data you can use the Example RTF Template file and Example Data XML file.
Here are some additional resources you may find useful in working out how BI Publisher charts work and how you can customise the XML definitions.