Android : Why this line xmlns:android="http://schemas.android.com/apk/res/android" must be the first

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Android : Why this line xmlns:android="http://schemas.android.com/apk/res/android" must be the first in the layout xml file?
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Android : Why this line xmlns:android="http://schemas.android.com/apk/res/android" must be the first in the layout xml file?
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the xmlns:android="http://schemas.android.com/apk/res/android" Why first layout this the xml in Android file? line be must :