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Why is xml so prominently displayed in IOC containers?

I am trying to get into IOC containers, and I notice that many of them use xml configuration. Can someone tell me why many new technologies are moving towards xml configuration / software models (WCF, WPF, Spring.NET, Unity, Windsor)? It seems that xml is a poor choice for defining complex settings, and it would be better to do this in code where things are typical and we have intellisense. I know that some may find this argument, but I'm really curious why these otherwise awesome, cutting-edge technologies rely on xml.

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I moved the Unity configuration to XML for only one reason - I can change the configuration without recompiling my code. This is very useful in some cases.

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He likes to wonder why the hammer has a steel head when you prefer to glue things together.

Building the application at runtime from declarative configuration files is the goal; DI itself is just a means to achieve it.

If you can copy the configuration, why use the IoC framework? Take a slightly more solid design and save yourself the pain.

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As to why they run in XML, I assume that DSL is required, and XML has the advantage of the existing rudimentary toolchain (editors, validators, parsers, etc.).

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No one mentioned that XML can be the result of an XSLT transformation, and custom DSLs can be created this way on top of a simple IoC configuration. This is a very powerful approach.

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