Validate elements that can be empty with XSD

Say you have an element looking like this:

    Catcher in the rye

and that element is allowed to also be empty. Like this:


How do you validate it? One way is to use the attribute “nillable” like this

      <xs:element name="book" type="xs:string" nillable="true"/>

This will validate both a “book” element that is empty and one that is not

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