Well... I don't think you'll find a book on this. This isn't XML programming as there is no such thing. The XML files are formatted markup language, true... but saying XML programming is like saying HTML programming. It's a poor term as any programming isn't in HTML but JavaScript or ASP/PHP etc.
The UI scripting is specific to EQ2 and pretty much the only source you're going to find on learning that is here in these forums or by looking at premade mods. Oh, and the UI documentation that SoE provides.
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