Question

考虑以下xml架构：

<?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>

这给了我以下错误消息：

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属于同一类型。错误4和5也是相同的类型。关于错误4 + 5：为什么派生类型必须与父类型具有相同类型的内容？这不能成为xml架构规则的一部分......这将是荒谬的。如果扩展类与父类（例如，由元素和属性组成）相比只有一个额外元素，那该怎么办？我是否必须为派生类创建一些属性才能使两个类相似？

我根本不知道我的代码中有什么问题。

Answer 1

错误1-3有意义，4-5是虚假的。也许当你修复前三个时它们会消失。编译器在发现错误后尝试继续沿着奇怪的路径行进并不罕见。

使用Saxon验证模式，我得到katze_ct和fink_ct的错误，可以通过删除虚假的complexContent元素来修复：

<xs:complexType name="katze_ct">
    <xs:sequence>
        <xs:element name="fellfarbe" type="xs:string"/>
    </xs:sequence>
</xs:complexType>

和behause_ct的错误，因为xs：属性放错地方，它应该是：

<xs:complexType name="behausung_ct">      
        <xs:sequence>
            <xs:element name="zootier" type="tier" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="name" type="xs:string"/>
    </xs:complexType>

通过这些更改，架构现在可以编译。

纯元素类型不能扩展混合类型的规则，反之亦然，这些规则是完全明智的规则，但您并没有违反这些规则。

xsd错误消息：＆＃34;派生类型的内容类型及其基类的内容类型必须混合或两者都是仅元素。＆＃34;

1 个答案: