XML验证失败，并显示错误“顶级未完成". [英] XML validation fails with error "Top level is not completed"

问题描述

我有一个看起来非常简单的xsd和xml文件示例，其中xml文件未通过验证.

I've got what seems like a very simple example of an xsd and xml file where the xml file does not validate.

下面是这两个文件的副本.

Copies of the two files are below.

id ='fixMe'的第一个xml元素出现错误，提示 顶层尚未完成. 有效的xml文档必须具有根标记

The first xml element with id = 'fixMe' gets an error that says Top level is not completed. Valid xml document must have a root tag

如果我删除其id属性或使用"idx"而不是"id"，就可以了.但我不知道为什么. "id"应该是有效的属性.

If I remove its id attribute or use "idx" instead of "id", it's fine. But I can't figure out why. 'id' should be a valid attribute.

任何见识表示赞赏.

XML:

<question id="fixMe" />
<question idx="ok"/>
<question />

XSD:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema"
           targetNamespace="perceptive.com/mi/analysis"
           xmlns="perceptive.com/mi/analysis"
           elementFormDefault="qualified" attributeFormDefault="unqualified">

<xs:element name="test" type="test"/>

<xs:complexType name="test">
    <xs:sequence minOccurs="1" maxOccurs="10">
        <xs:element name="question" type="question_type"/>
    </xs:sequence>
</xs:complexType>

<xs:complexType name="question_type">
    <xs:attribute name="idx" type="xs:string" use="optional"/>
    <xs:attribute name="id"  type="xs:string" use="optional"/>
</xs:complexType>

</xs:schema>

推荐答案

一个XML文档只有格式正确才能有效.

An XML document cannot be valid until it is well-formed.

因此，您应该在XML文档中指定一个根标记，例如:

So you should specify a root tag in XML document, e.g.:

<root>
    <question id="fixMe" />
    <question idx="ok"/>
    <question />
</root>

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