In Directed Graph Documents I gave you an overview of DGML and included a Demos.zip file. Hopefully you’ve had a chance to download those and play with them. In this video (WMV, 40mb) I go through conditional styling in more depth to show you how to spruce up your DGML diagrams.
I also explain the Legend, talk about its limitations, and show how to edit styles manually in the DGML and get XSD intellisense which will help you remember the various properties that are supported in conditional styles.
The thing that’s really interesting about conditional styles is when they make some hidden data in your graph really pop out. If you combine careful use of color, font, font size, outline, icons, and grouping, not to mention link styles and labels, you can convey a lot of information in one powerful picture.
In this video you will learn about the Legend UI, the DGML representation for Styles, and see what the GroupLabel, ValueLabel properties do to the Legend UI, and learn more about what you can do in Conditional Expressions and learn about the importance of order when creating new styles. For more information on conditional styles the full BNF syntax is available.