library_query.xml

<?xml version="1.0" encoding="UTF-8"?>
<a:query xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://arolios.org/arolios/tqry ../schemas/query.xsd"
	xmlns:a="http://arolios.org/arolios/tqry"
    name="query1">
    <parameter>room_name</parameter>
    <parameter>kind_of_book</parameter>
    <class domain="library" name="book">
        <property>title</property>
        <filter>kind = $kind_of_book </filter>
        <memberEnd name="shelving">
                <class>
                    <property>number</property>
                    <memberEnd name="room">
                        <class>
                            <property>name</property>
                            <filter>name = $room_name </filter>
                        </class>
                    </memberEnd>
                </class>
        </memberEnd>
        <memberEnd name="writers">
            <class>
                <property>name</property>
            </class>
        </memberEnd>
    </class>
</a:query>