Stacked column chart from XML data source

Question

I have an XML file, which lists elements with three
attributes: date, inactive-interval, user-count.
I need to build a stacked column chart with a single column
for each distinct date, one stack for each distinct
inactive-interval for that date, and the height of the stack equal
to the user-count.
I can define ColumnSeries with yField="user-count"
xField="date", but I don't know how to partition the column into
stacks by inactive-interval values.
Here is a sample data set:
<?xml version="1.0" encoding="ISO-8859-1"?>
<data>
<snapshot date="01/01/2007" inactive-interval="0"
user-count="3"/>
<snapshot date="01/01/2007" inactive-interval="7"
user-count="2"/>
<snapshot date="01/01/2007" inactive-interval="30"
user-count="4"/>
<snapshot date="01/02/2007" inactive-interval="0"
user-count="4"/>
<snapshot date="01/02/2007" inactive-interval="7"
user-count="2"/>
<snapshot date="01/02/2007" inactive-interval="30"
user-count="3"/>
</data>

Answer 1

Your CategoryAxis id="ha_ccm" uses categoryField="period", and this is the label for the your series (i.e. "Quarter 4/2010"). You cannot have multiple categoryFields for the CategoryAxis; it can only use one data field for the labels. You can use data tips and/or label functions to show the individual series' values on the columns.
Also:
Your labelField in the ColumnSeries are set to a ColumnSet name instead of a field name in your dataprovider.
Font must be embedded if you set ColumnChart.showLabelVertically="true".