XML Schema 1.0中是否有<assert>的替代方案？

Question

我有一个以下的XSD文档片段，当XML文件根据此模式验证时，我希望确保mm:Depot和mm:Customer/mm:County中的值相同，并且受到Location类型中项目的限制。

在XML Schema 1.0中可以通过某些巧妙的方法来实现，但是这可以在XML Schema 1.1中使用<assert>标记完成。

<xsd:element name="DeliveryOrder" type="OrderDetails" />

<xsd:complexType name="OrderDetails">
    <xsd:sequence>
        <xsd:element name="Depot" type="mm:Location" />
        <xsd:element name="Customer" type="mm:Customer" maxOccurs="1" minOccurs="1" />
    </xsd:sequence> 
</xsd:complexType>

<xsd:simpleType name="Location">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="OverHere" />
        <xsd:enumeration value="OverThere" />
    </xsd:restriction>
</xsd:simpleType>

<xsd:complexType name="Customer">   
    <xsd:sequence>
        <xsd:element name="firstname" type="string" />
        <xsd:element name="surname" type="string" />
        <xsd:element name="County" type="mm:Location" />
    </xsd:sequence>
</xsd:complexType>

我希望实现的是以下内容...

<?xml version="1.0" encoding="UTF-8"?>
<mm:DeliveryOrder xmlns:mm="http://myNamespace/DeliveryOrderSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://myNamespace/DeliveryOrderSchema DeliveryOrder.xsd ">

  <mm:Depot>OverThere</mm:Depot>
  <mm:Customer>
    <mm:firstname>Jane</mm:firstname>
    <mm:surname>Doe</mm:surname>
    <mm:County>OverThere</mm:County>
  </mm:Customer>
</mm:DeliveryOrder>

请注意，值OverThere出现了两次。

- cymorg

Answer 1

你可以使用“参照完整性”。

<?xml version="1.0" encoding="utf-8" ?>
<!-- XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com) -->
<xsd:schema targetNamespace="http://myNamespace/DeliveryOrderSchema" xmlns="http://myNamespace/DeliveryOrderSchema" xmlns:mm="http://myNamespace/DeliveryOrderSchema" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="DeliveryOrder" type="OrderDetails">
        <xsd:key name="LocationDepot">
            <xsd:selector xpath="mm:Depot"/>
            <xsd:field xpath="."/>
        </xsd:key>
        <xsd:keyref refer="LocationDepot" name="CustomerLocation">
            <xsd:selector xpath="mm:Customer"/>
            <xsd:field xpath="mm:County"/>
        </xsd:keyref>
    </xsd:element>

    <xsd:complexType name="OrderDetails">
        <xsd:sequence>
            <xsd:element name="Depot" type="Location"/>
            <xsd:element name="Customer" type="Customer" maxOccurs="1" minOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:simpleType name="Location">
        <xsd:restriction base="xsd:string">
            <xsd:enumeration value="OverHere"/>
            <xsd:enumeration value="OverThere"/>
        </xsd:restriction>
    </xsd:simpleType>

    <xsd:complexType name="Customer">
        <xsd:sequence>
            <xsd:element name="firstname" type="xsd:string"/>
            <xsd:element name="surname" type="xsd:string"/>
            <xsd:element name="County" type="Location"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:schema>

一个错误可能如下所示：

在加载[]时发生错误，行10位置3 键序列“OverHere”在“http://myNamespace/DeliveryOrderSchema:LocationDepot”Keyref中无法引用某些键。

- Petru Gardea