Scrollview and relative layout not working properly

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http://stackoverflow.com – I am a windows devloper but I want to develop android application. I am so bad in XML. As usual my newbies question is what is wrong with below XML file?? <?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mainScrollView" android:layout_width="fill_parent" android:layout_height="wrap_content" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="mat (HowTos)