XQuery：在保留标记的同时标记文本

考虑以下XQuery代码：

let $foo := <root>This is a <tag>test</tag>. This is <tag>only</tag> a <tag>test</tag>.</root>
for $s in tokenize($foo, "\. ")
return <sentence>{$s}</sentence>

假设我想将$foo拆分成句子，同时保留嵌入的标记，给出如下输出：

<sentence>this is a <tag>test</tag>.</sentence>
<sentence>this is <tag>only</tag> a <tag>test</tag>.</sentence>

---

我应该如何解决这个问题？

我希望这就是您想要的：

let $foo := <root>This is a <tag>test</tag>. This is <tag>only</tag> a <tag>test</tag>.</root>
for $s in tokenize(xdmp:quote($foo/node()), "\. ")
return xdmp:unquote("<sentence>"||$s||"</sentence>")

let $foo := <root>This is a <tag>test</tag>. This is <tag>only</tag> a <tag>test</tag>.</root>
for $s in tokenize(xdmp:quote($foo/node()), "\. ")
return xdmp:unquote("<sentence>"||$s||"</sentence>")