xml - BaseX 属性无法序列化

Question

我有这个简单的 XML 文件:

<catalog>
  <product dept="WMN">
    <number>557</number>
    <name language="en">Fleece Pullover</name>
    <colorChoices>navy black</colorChoices>
  </product>
  <product dept="ACC">
    <number>563</number>
    <name language="en">Floppy Sun Hat</name>
  </product>
  <product dept="ACC">
    <number>443</number>
    <name language="en">Deluxe Travel Bag</name>
  </product>
  <product dept="MEN">
    <number>784</number>
    <name language="en">Cotton Dress Shirt</name>
    <colorChoices>white gray</colorChoices>
    <desc>Our<i>favorite</i>shirt!</desc>
  </product>
</catalog>

我正在读一本书 XQuery by Priscila Walmsley它说要输入命令:

doc("catalog.xml")/*/product/@dept

所以我输入 BaseX

xquery doc("catalog.xml")/*/product/@dept

我收到这个错误:

Error:
[SENR0001] Attributes cannot be serialized:attribute dept { "WMN" }.

尽管书上说:

will return the four dept attributes in the input document.

我做错了什么？

Answer 1

BaseX 只是对序列化很严格。如果您将属性节点强制为字符串，它不会提示:

xquery doc("catalog.xml")/*/product/@dept/string()