[英]Restrict value of an XML attribute to different attribute's/element's value
我将从一个例子开始
<template>
<components>
<component name="switch" />
<component name="server" />
</components>
<layout>
<grid>
<position componentName="switch" positionX="0" positionY="0" />
</grid>
</layout>
</template>
我想要的是限制componentName
属性中的值以匹配上面在components
指定的名称之一。 JAXB有可能吗? 因为我需要带注释的类,然后将其用于生成XSD。
根据您的情况,XSD 1.0可以通过key / keyref组合来强制执行“参照完整性”。 但是,我不知道JAXB中这些构造有什么注释(听起来好像您正在从Java类中生成XSD)。 至少我从未遇到过这样的注释(请参阅此处的列表)
<?xml version="1.0" encoding="utf-8"?>
<!--XML Schema generated by QTAssistant/XML Schema Refactoring (XSR) Module (http://www.paschidev.com)-->
<xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="template">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="components">
<xsd:complexType>
<xsd:sequence>
<xsd:element maxOccurs="unbounded" name="component">
<xsd:complexType>
<xsd:attribute name="name" type="xsd:string" use="required" />
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="layout">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="grid">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="position">
<xsd:complexType>
<xsd:attribute name="componentName" type="xsd:string" use="required" />
<xsd:attribute name="positionX" type="xsd:unsignedByte" use="required" />
<xsd:attribute name="positionY" type="xsd:unsignedByte" use="required" />
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:key name="ComponentsKey">
<xsd:selector xpath="components/component"/>
<xsd:field xpath="@name"/>
</xsd:key>
<xsd:keyref name="MatchComponent" refer="ComponentsKey">
<xsd:selector xpath="layout/grid/position"/>
<xsd:field xpath="@componentName"/>
</xsd:keyref>
</xsd:element>
</xsd:schema>
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