lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/data/apicheck/attribute.xml

<Button
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:text="Hello"
    android:enabled="?android:indicatorStart"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />