XML Schema Validation Example

<order>
    <customerId>234219</customerId>
    <article>
        <articleId>21692</articleId>
        <count>3</count>
    </article>
    <article>
        <articleId>24749</articleId>
        <count>9</count>
    </article>
    <deliveryDate>2009-01-23</deliveryDate>
    <payed>yes</payed>
</order>