I will start with an example
<template>
<components>
<component name="switch" />
<component name="server" />
</components>
<layout>
<grid>
<position componentName="switch" positionX="0" positionY="0" />
</grid>
</layout>
</template>
What I want is to restrict values in componentName
attribute to match one of the names specified above in components
. Is this possible in JAXB? Because I need to have annotated classes which are then used to generate XSD.
Given your scenario, XSD 1.0 can enforce your "referential integrity" through a key/keyref combo. However, I am not aware of what annotations there are for these constructs in JAXB (it sounds as if you're looking at generating an XSD from you Java classes); at least I never ran into such annotations (see the list here )
<?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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