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Yeah, i've never done any research into DSL's, but I always thought they would have some sort of custom syntax. Since DSL's seem quite the hype ATM, I'm a bit dissapointed by these examples. Sure, nice coding and all that (even though I would have used LINQ myself, but then again I'm not restricted to C# 2.0), but I fail to to see where the L of DSL comes into play.

If this is the latest hype I didn't have time for to research, I'm not missing out.

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There are two types of DSLs, internal and external. External ones are the custom syntax you talk of, internal are DSLs that use features or quirks of a host language to appear different.

XML or SQL are external DSLs, much of the cool Ruby stuff like Rake and Rails are internal DSLs. The examples presented are all internal (presumably for a good reason). There are advantages to both approaches. Read Martin Fowler's discussion at http://martinfowler.com/dslwip/

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