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Priscila Walmsley的一本名为XQuery的书,它说要输入命令:

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

所以我输入BaseX

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

我收到此错误:

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

尽管那本书说:

将返回输入文档中的四个dept属性.

我究竟做错了什么？

Answer 1

BaseX对序列化严格要求.如果强制将属性节点强制转换为字符串,则不会抱怨:

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