<?xml version="1.0" encoding="utf-8"?><ViewGroup  //A container for other View elements    xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@[+][package:]id/resource_name"    android:layout_height=["dimension" | "fill_parent" | "wrap_content"]    android:layout_width=["dimension" | "fill_parent" | "wrap_content"]    [ViewGroup-specific attributes] >
    <View //An individual UI component, generally referred to as a "widget".        android:id="@[+][package:]id/resource_name"        android:layout_height=["dimension" | "fill_parent" | "wrap_content"]        android:layout_width=["dimension" | "fill_parent" | "wrap_content"]        [View-specific attributes] >        <requestFocus/>//Any element representing a View object can include this empty element, which gives its parent initial focus on the screen. You can have only one of these elements per file.    </View>
    <ViewGroup >        <View />    </ViewGroup>
    <include layout="@layout/layout_resource"/>
</ViewGroup>