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In OpenLaszlo, you can create trees of nested instances with XML tags, and when you define a class, its name becomes an XML tag you can use to create instances of that class. That lets you create your own domain specific declarative XML languages for creating and configuring objects (using constraint expressions and XML data binding, which makes it very powerful).

This gives me nightmares of over engineered xml programming that is infamous I the Java community. You lose all of the benefits of static type checking.

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