Here's a layout from the DevGuide: 
http://developer.android.com/guide/topics/ui/declaring-layout.html

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
             android:layout_width="fill_parent"
             android:layout_height="fill_parent"
             android:orientation="vertical" >
   <TextView android:id="@+id/text"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="Hello, I am a TextView" />
   <Button android:id="@+id/button"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="Hello, I am a Button" />
</LinearLayout>

- What does xmlns mean?
- What is the android:xxx sytnax all about?
- What does the "http://schemas.android.com/apk/res/android"; do?
- Are there other values I might choose?  (ex. "http://
schemas.android.com/apk/res/iPhone")
- Can you create your own Layouts like the "LinearLayout"?
- Is there a list of available components like "Button", "TextView"?
- What does the @, the / and the + symbol do?
- Can I edit this directly in Eclipse with a graphical editor rather
than editing the xml text?

That's a lot of questions.  So let me sum these up into one simple
question:

Does anyone know a link to the specification for the XML Layout
Language for Android?

Thanks for any hints for a complete newbie.

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