[英]No referenced value found for keyRef using XML Schema xs:key and xs:keyref
我正在尝试向我的XML Schema模式添加约束,但是我遇到了一个错误。 我不断得到:
我不知道我在做什么错。 我的keyref显然工作正常,但key无效。 我该如何解决?
这是模式:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element name="articles">
<xs:complexType>
<xs:sequence>
<xs:element name="article" type="article" maxOccurs="unbounded">
<xs:keyref name="author" refer="authorKey">
<xs:selector xpath="author"/>
<xs:field xpath="@ref-number"/>
</xs:keyref>
<xs:unique name="unique-author">
<xs:selector xpath="author"/>
<xs:field xpath="@ref-number"/>
</xs:unique>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="authors" type="authors" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="article">
<xs:sequence>
<xs:element name="author" maxOccurs="unbounded" minOccurs="1">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="ref-number" type="xs:integer" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="authors">
<xs:sequence>
<xs:element name="author" type="author">
<xs:key name="authorKey">
<xs:selector xpath="."/>
<xs:field xpath="@key-number"/>
</xs:key>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="author">
<xs:attribute name="key-number" type="xs:integer" use="required" />
</xs:complexType>
</xs:schema>
这是无法验证的示例XML文件:
<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="m5-schema.xsd">
<articles>
<article>
<author ref-number="2"></author>
<author ref-number="3"></author>
</article>
</articles>
<authors>
<author key-number="2">
</author>
</authors>
</root>
这似乎是一个范围问题,因此将关键约束移至根并为根定义命名类型会有所帮助:
<xs:element name="root" type="root">
<xs:keyref name="author" refer="authorKey">
<xs:selector xpath=".//article/author"/>
<xs:field xpath="@ref-number"/>
</xs:keyref>
<xs:unique name="unique-author">
<xs:selector xpath=".//authors/author"/>
<xs:field xpath="@ref-number"/>
</xs:unique>
</xs:element>
<xs:complexType name="root">
<xs:sequence>
<xs:element name="articles">
<xs:complexType>
<xs:sequence>
<xs:element name="article" type="article" maxOccurs="unbounded">
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="authors" type="authors" />
</xs:sequence>
</xs:complexType>
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.