有人可能会说:如果你可以编辑两个 XSD,为什么还要重新定义呢?
我将向您展示如何使它与 XSD 重新定义一起工作,至少从 XSD 的角度来看。但是,鉴于 JAXB 的限制,它不能开箱即用。如果您还使用自动 XSD 重构作为额外的步骤,那么您可以使其工作,并且在此过程中,您将保留您在使用 xsd:redefine 时看到的价值主张。
因此,在此之前,这是另一种也使用组合但没有xsd:redefine
; 从维护和验证的角度来看,您获得的价值和使用情况大致相同。
我将您的第一个 XSD 称为Model1
,将您的第二个 XSD 称为Model2
. 我将从一个 XSD 开始,它将为您提供与xs:redefine
.
常见项目,xsd-allow-extension-compatibility-and-validation-common-items.xsd:
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com)-->
<xs:schema xmlns="example"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="example"
elementFormDefault="qualified" attributeFormDefault="qualified">
<xs:group name="typeA">
<xs:sequence>
<xs:element name="elA" type="xs:string" />
</xs:sequence>
</xs:group>
<xs:element name="root" type="typeA" />
</xs:schema>
Model1“项目”,xsd-allow-extension-compatibility-and-validation-model1-items.xsd:
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com)-->
<xs:schema xmlns="example"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="example"
elementFormDefault="qualified" attributeFormDefault="qualified">
<xs:complexType name="typeA">
<xs:sequence>
<xs:group ref="typeA" />
<xs:any namespace="##any" minOccurs="0" processContents="lax" />
</xs:sequence>
</xs:complexType>
</xs:schema>
Model2“项目”,xsd-allow-extension-compatibility-and-validation-model2-items.xsd:
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com)-->
<xs:schema xmlns="example"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="example"
elementFormDefault="qualified" attributeFormDefault="qualified">
<xs:complexType name="typeA">
<xs:sequence>
<xs:group ref="typeA" />
<xs:element name="newElement" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:schema>
如果您将 Common Items 和 Model1,或 Common Items 和 Model2 传递给 JAXB 编译器,它将完全按照您想要的方式创建类。为了便于使用(测试)和说明,我创建了另外两个 XSD:
型号1:
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com)-->
<xs:schema xmlns="example"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="example"
elementFormDefault="qualified" attributeFormDefault="qualified">
<xs:include schemaLocation="xsd-allow-extension-compatibility-and-validation-common-items.xsd"/>
<xs:include schemaLocation="xsd-allow-extension-compatibility-and-validation-model1-items.xsd"/>
</xs:schema>
型号2:
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSD Module (http://www.paschidev.com)-->
<xs:schema xmlns="example" attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace="example" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:include schemaLocation="xsd-allow-extension-compatibility-and-validation-common-items.xsd"/>
<xs:include schemaLocation="xsd-allow-extension-compatibility-and-validation-model2-items.xsd"/>
</xs:schema>
这是您在 Model1 上运行 xjc 时得到的结果:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "typeA", propOrder = {
"elA",
"any"
})
public class TypeA {
@XmlElement(required = true)
protected String elA;
@XmlAnyElement(lax = true)
protected Object any;
/**
* Gets the value of the elA property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getElA() {
return elA;
}
/**
* Sets the value of the elA property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setElA(String value) {
this.elA = value;
}
/**
* Gets the value of the any property.
*
* @return
* possible object is
* {@link Element }
* {@link Object }
*
*/
public Object getAny() {
return any;
}
/**
* Sets the value of the any property.
*
* @param value
* allowed object is
* {@link Element }
* {@link Object }
*
*/
public void setAny(Object value) {
this.any = value;
}
}
...当您再次运行 xjc 模型2时:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "typeA", propOrder = {
"elA",
"newElement"
})
public class TypeA {
@XmlElement(required = true)
protected String elA;
@XmlElement(required = true)
protected String newElement;
/**
* Gets the value of the elA property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getElA() {
return elA;
}
/**
* Sets the value of the elA property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setElA(String value) {
this.elA = value;
}
/**
* Gets the value of the newElement property.
*
* @return
* possible object is
* {@link String }
*
*/
public String getNewElement() {
return newElement;
}
/**
* Sets the value of the newElement property.
*
* @param value
* allowed object is
* {@link String }
*
*/
public void setNewElement(String value) {
this.newElement = value;
}
}
Model1 和 Model2 XSD 将完全按照您的预期方式验证您的 XML。
下图显示了 XSD 文件之间的关系。绿色表示“xsd:include”,箭头指向“包含”。
更新:我刚刚注意到,根据@Kevin 的评论,您在重新定义中的新元素上没有 maxOccurs。在这种情况下,您可以使用一个重新定义,如下所示:
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSR Module (http://www.paschidev.com)-->
<xsd:schema xmlns="example" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="example" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:redefine schemaLocation="xsd-allow-extension-compatibility-and-validation.xsd">
<xsd:complexType name="typeA">
<xsd:complexContent>
<xsd:restriction base="typeA">
<xsd:sequence>
<xsd:element name="elA" type="xsd:string" />
<xsd:element name="newElement" type="xsd:string" />
</xsd:sequence>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>
</xsd:redefine>
</xsd:schema>
唯一的问题似乎是 JAXB(最新)仍然使用通配符生成一个类。
更新 2:根据 Kevin 的评论,两个避免两个重新定义,应该使用一个组而不是 xsd:any。
如果您实际上计划使用多个元素来扩展新模型,请继续阅读。下面是唯一的方法,它需要使用一个组来进一步细化任何粒子。
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XSR Module (http://www.paschidev.com)-->
<xsd:schema xmlns="example" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="example" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:redefine schemaLocation="xsd-allow-extension-compatibility-and-validation.xsd">
<xsd:complexType name="typeA">
<xsd:complexContent>
<xsd:restriction base="typeA">
<xsd:sequence>
<xsd:element name="elA" type="xsd:string" />
<xsd:group ref="group1" minOccurs="0">
</xsd:sequence>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>
</xsd:redefine>
<xsd:group name="group1">
<xsd:sequence>
<xsd:element name="newElement" type="xsd:string" />
</xsd:sequence>
</xsd:group>
</xsd:schema>
最终结果是新的 XSD 可用于验证 Model1,而原始文件仍然是 Model1。