Strange error related to an XML file

I'm facing a strange problem and I can't figure out why I systematically get an unexpected stop of my application when I try to inflate the following XML file in the onCreateView of my class which extends the Fragment class :

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"    
    android:background="@drawable/fond_application_horizontal">

<Button 
    android:id="@+id/ZoomPlusY"
    android:layout_height="140dip"
    android:layout_width="40dip"
    android:text="Y+">            
</Button>


<Button 
    android:id="@+id/ZoomMoinsY"
    android:layout_height="140dip"
    android:layout_width="40dip"
    android:layout_below="@id/ZoomPlusY"
    android:text="Y-">            
</Button>

<Button
    android:id="@+id/ZoomOptimum"
    android.layout.width="70dip"
    android.layout.height="40dip"
    android:layout_below="@id/ZoomMoinsY"
    android:text="Opt">
</Button>

<开发者_如何学Go/RelativeLayout>

If I suppress the third button, the XML file is perfectly inflated and the application doesn't crash.

Any idea?

Thanks in advance for the time you will spend trying to help me.

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You should probably include your logcat traceback, but immediately at looking at your layout I see at least one problem:

android.layout.width="70dip"
android.layout.height="40dip"

Those property names should be android:layout_height and android:layout_width.

Also, android:orientation is meaningless on a RelativeLayout.

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Why are you using the dot syntax in your third button android.layout.width ? It is a copy error or this is how your XML realy looks like?