HTML Emitter - How to get the axis description of the charts

Hi,

I'm modifying the HTML emitter and want to know if there is any possibility to get the axis description of bar charts. Better would be information about the dataset.
I want to read out the entire Information about charts.

In this class:

org.eclipse.birt.report.engine.emitter.html.HTMLReportEmitter.java


is a method startImage() which receives an image with some informations about the bars but I also need the information about the axis, about the chart type and so on. How does the startImage() method works and how the method is called?

Regards,
Samo