1
考虑下面的XML架构:xsd错误消息:“派生类型的内容类型和其基类的内容类型必须混合使用,或者都是仅使用元素。”
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" elementFormDefault="qualified"
vc:minVersion="1.0" vc:maxVersion="1.1">
<xs:element name="zoo">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="zootier" type="tier" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="tier">
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="alter" type="xs:positiveInteger"/>
</xs:sequence>
<xs:attribute name="id" type="xs:ID"/>
</xs:complexType>
<xs:complexType name="säugetier_ct">
<xs:complexContent>
<xs:extension base="tier">
<xs:sequence>
<xs:element name="tragezeit" type="xs:positiveInteger"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="pferd_ct">
<xs:complexContent>
<xs:extension base="tier">
<xs:attribute name="schimmel" type="xs:boolean"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="katze_ct">
<xs:complexContent>
<xs:sequence>
<xs:element name="fellfarbe" type="xs:string"/>
</xs:sequence>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="vogel_ct">
<xs:complexContent>
<xs:extension base="tier">
<xs:attribute name="flugfaehig" type="xs:boolean"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="gans_ct">
<xs:complexContent>
<xs:extension base="tier">
<xs:sequence>
<xs:element name="schlachtgewicht" type="xs:double"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="fink_ct">
<xs:complexContent>
<xs:sequence>
<xs:element name="beringt" type="xs:boolean"/>
</xs:sequence>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="pfleger">
<xs:sequence>
<xs:element name="pflegt" maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="tier" type="xs:IDREF"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:complexType name="behausung_ct">
<xs:attribute name="name" type="xs:string"/>
<xs:sequence>
<xs:element name="zootier" type="tier" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="gebäude_ct">
<xs:complexContent>
<xs:extension base="behausung_ct">
<xs:sequence>
<xs:element name="flaeche" type="xs:double"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="teich_ct">
<xs:complexContent>
<xs:extension base="behausung_ct">
<xs:sequence>
<xs:element name="wassertiefe" type="xs:double"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>
这使我有以下错误消息:
Error1: The content of 'katze_ct' is invalid. Element 'sequence' is invalid, misplaced, or occurs too often.
Error2: The content of 'fink_ct' is invalid. Element 'sequence' is invalid, misplaced, or occurs too often.
Error3: The content of 'behausung_ct' is invalid. Element 'sequence' is invalid, misplaced, or occurs too often.
Error 4: The content type of a derived type and that of its base must both be mixed or both be element-only. Type 'gebäude_ct' is element only, but its base type is not.
Error 5: The content type of a derived type and that of its base must both be mixed or both be element-only. Type 'teich_ct' is element only, but its base type is not.
错误1-3是同一类型的。错误4和5也是同一类型。 关于错误4 + 5:为什么派生类型必须具有与父类型相同的内容类型?这不能是xml架构规则的一部分......这将是荒谬的。如果扩展类与父类相比只有一个附加元素(例如由元素和属性组成),该怎么办?我是否必须为派生类创造一些属性才能使这两个类相似?
我根本不明白我的代码有什么问题。
非常感谢您的回答!现在正在验证。 – Tommy