lint/cli/src/test/java/com/android/tools/lint/checks/data/res/layout/customview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:other="http://schemas.foo.bar.com/other"
    xmlns:foo="http://schemas.android.com/apk/res/foo"
    android:id="@+id/newlinear"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <foo.bar.Baz
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button1"
        foo:misc="Custom attribute"
        tools:ignore="HardcodedText" >
    </foo.bar.Baz>

    <!-- Wrong namespace uri prefix: Don't warn -->
    <foo.bar.Baz
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button1"
        other:misc="Custom attribute"
        tools:ignore="HardcodedText" >
    </foo.bar.Baz>

</LinearLayout>