1
考慮下面的XML架構:xsd錯誤消息:「派生類型的內容類型和其基類的內容類型必須混合使用,或者都是僅使用元素。」
<?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>
這使我有以下錯誤消息:
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.
錯誤1-3是同一類型的。錯誤4和5也是同一類型。 關於錯誤4 + 5:爲什麼派生類型必須具有與父類型相同的內容類型?這不能是xml架構規則的一部分......這將是荒謬的。如果擴展類與父類相比只有一個附加元素(例如由元素和屬性組成),該怎麼辦?我是否必須爲派生類創造一些屬性才能使這兩個類相似?
我根本不明白我的代碼有什麼問題。
非常感謝您的回答!現在正在驗證。 – Tommy