Android data binding attribute not found

Bind the variables using @{ }

activity_main.xml

</layout>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".simple.MainActivity">

        <include layout="@layout/content_main_data_binding"
            bind:name="@{ "Hello World" }" />
    
    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>

content_view.xml

</layout>

    <data>
    <variable
        name="name"
        type="String" />
    </data>

    <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{ name }"/>

 </layout>

GL

I think I've hit upon the solution. To activate data binding, you need to use a @{} expression, and what's in the braces must be valid Java code. So a literal string must be enclosed in quotes... which must be encoded as " inside an XML attribute value. Put it all together and you get:

<include
    layout="@layout/custom_edit_text"
    app:hint123="@{&quot;Email&quot;}"/>

Data binding does work for include files, it's just that the syntax for a literal is a bit convoluted. I had the same issue and this form is working in my project.