<?xml version="1.0" encoding="UTF-8"?>
<element name="BookStore" xmlns="http://relaxng.org/ns/structure/1.0">
    <oneOrMore>
        <element name="Book">
            <element name="Title">
                <text/>
            </element>
            <element name="Author">
                <text/>
            </element>
            <element name="Date">
                <text/>
            </element>
            <element name="ISBN">
                <text/>
            </element>
            <element name="Publisher">
                <text/>
            </element>
            <optional>
                <element>     
                    <anyName/>
                    <text/>
                </element>
                <zeroOrMore>
                    <element>     
                        <anyName/>
                        <text/>
                    </element>
                </zeroOrMore>
            </optional>
        </element>
    </oneOrMore>
</element>