so...
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:my_tag="http://schemas.android.com/apk/res-auto"
instead of...
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:my_tag="http://schemas.android.com/apk/res/com.my_company.xyz"
and then use your tag...