title: frequent issues arising in android view, Error parsing XML: unbound prefix
body: <p>I have frequent problem in android view, <code>Error parsing XML: unbound prefix on Line 2</code>.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout android:orientation="vertical" android:id="@+id/myScrollLayout" 
  android:layout_width="fill_parent"  android:layout_height="wrap_content"&gt;
      &lt;TextView android:layout_height="wrap_content" android:layout_width="fill_parent" 
      android:text="Family" android:id="@+id/Family" 
      android:textSize="16px" android:padding="5px" 
      android:textStyle="bold" android:gravity="center_horizontal"&gt;
      &lt;/TextView&gt;
  
      &lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="fill_parent" android:layout_height="wrap_content"
          android:orientation="vertical" android:scrollbars="vertical"&gt;
          &lt;LinearLayout android:orientation="vertical" android:id="@+id/myMainLayout" 
          android:layout_width="fill_parent"  android:layout_height="wrap_content"&gt;
          &lt;/LinearLayout&gt;
      &lt;/ScrollView&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>