Java - commentaires dans le fichier xml Android à l'intérieur de la définition de composant ne fonctionne pas - Stack Overflow

Why do I get error when I comment a line inside objects definition?:

   <ListView
        android:id="@+id/optionList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:entries="@array/option_array"
    <!-- android:onClick="optionListClick"  -->//here is NOT fine, xml does not compile
 />
 <!-- android:onClick="optionListClick"  -->//here is fine

Why do I get error when I comment a line inside objects definition?:

   <ListView
        android:id="@+id/optionList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:entries="@array/option_array"
    <!-- android:onClick="optionListClick"  -->//here is NOT fine, xml does not compile
 />
 <!-- android:onClick="optionListClick"  -->//here is fine

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