What are the real-world benefits of declarative-UI languages such as XAML and QML?

Posted by Stu Mackellar on Stack Overflow See other posts from Stack Overflow or by Stu Mackellar
Published on 2010-04-24T20:37:25Z Indexed on 2010/04/24 20:43 UTC
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wpf

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xaml

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qml

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qtquick

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qt

I'm currently evaluating QtQuick (Qt User Interface Creation Kit) which will be released as part of Qt 4.7. QML is the JavaScript-based declarative language behind QtQuick.

It seems to be a very powerful concept, but I'm wondering if anybody that's made extensive use of other, more mature declarative-UI languages like XAML in WPF or Silverlight can give any insight into the real-world benefits that can be gained from this style of programming. Various advantages are often cited:

Speed of development
Forces separation between presentation and logic
Better integration between coders and designers
UI changes don't require re-compilation

Also, are there any downsides? A few potential areas of concern spring to mind:

Execution speed
Memory usage
Added complexity

Are there any other considerations that should be taken into account?

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