使用XQuery获取复杂混合元素的字符串内容

For, example, there is an xml:

例如,有一个xml:

<article-list xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="3.xsd">
    <article section="physics">
        Increasing linear dynamic range of commercial digital photocamera
        <author>M. V. Konnik</author>
        <content>
            Methods of increasing linear optical dynamic range
        </content>
    </article>
<