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Android-er: Unexpected namespace prefix "xmlns" found for tag fragment on xmlns:map="http://schemas.android.com/apk/res-auto"
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Open Source For Geeks: Android : URI is not registered (Settings | Project Settings | Schemas and DTDs)
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when using a custom namespace attribute in a library project, use the namespace "http://schemas.android.com/apk/res-auto" instead - Stack Overflow
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