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Current File : //home/rtorresani/www/vendor/magento/framework/Setup/Declaration/Schema/etc/constraints/foreign.xsd

<?xml version="1.0" encoding="UTF-8"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
    <xs:include schemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/constraints/constraint.xsd" />
    <!--@TODO: why we need to specify table?-->
    <xs:complexType name="foreign">
        <xs:annotation>
            <xs:documentation>
                With help of this element, foreign key constraint can be described.
                This constraint allows to have reference
                For this you need 4 settings, described below.
            </xs:documentation>
        </xs:annotation>

        <xs:sequence />

        <xs:attribute name="table" type="xs:string" />
        <xs:attribute name="column" type="xs:string" />
        <xs:attribute name="referenceColumn" type="xs:string" />
        <xs:attribute name="referenceTable" type="xs:string" />
        <xs:attribute name="onDelete" type="referenceOptionsType"  />

        <xs:attributeGroup ref="baseConstraint" />
    </xs:complexType>
    
    <xs:simpleType name="referenceOptionsType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="CASCADE" />
            <xs:enumeration value="SET NULL" />
            <xs:enumeration value="NO ACTION" />
        </xs:restriction>
    </xs:simpleType>
</xs:schema>