<?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">
    <xs:element name="config">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="module" type="moduleDeclaration" minOccurs="1" maxOccurs="unbounded" />
            </xs:sequence>
        </xs:complexType>
        <xs:unique name="uniqueModuleName">
            <xs:annotation>
                <xs:documentation>
                    Module name must be unique.
                </xs:documentation>
            </xs:annotation>
            <xs:selector xpath="module"/>
            <xs:field xpath="@name"/>
        </xs:unique>
    </xs:element>

    <xs:complexType name="moduleDeclaration">
        <xs:annotation>
            <xs:documentation>
                Module declaration.
            </xs:documentation>
        </xs:annotation>
        <xs:all>
            <xs:element minOccurs="0" maxOccurs="1" name="sequence" type="moduleSequence">
                <xs:unique name="uniqueSequenceName">
                    <xs:annotation>
                        <xs:documentation>
                            Dependency name must be unique.
                        </xs:documentation>
                    </xs:annotation>
                    <xs:selector xpath=".//*" />
                    <xs:field xpath="@name" />
                </xs:unique>
            </xs:element>
        </xs:all>
        <xs:attribute name="name" type="moduleName" use="required" />
        <xs:attribute name="setup_version" type="setupVersion" use="optional" />
    </xs:complexType>

    <xs:complexType name="moduleSequence">
        <xs:annotation>
            <xs:documentation>
                Module dependency root element.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence maxOccurs="unbounded">
            <xs:element minOccurs="0" maxOccurs="unbounded" name="module">
                <xs:complexType>
                    <xs:annotation>
                        <xs:documentation>
                            Module dependency that represents another module.
                        </xs:documentation>
                    </xs:annotation>
                    <xs:attribute name="name" type="moduleName" use="required" />
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:simpleType name="moduleName">
        <xs:annotation>
            <xs:documentation>
                Module name attribute can contain only [A-Za-z0-9_].
            </xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern value="[A-Z]+[A-Za-z0-9]{1,}_[A-Z]+[A-Z0-9a-z]{1,}" />
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="setupVersion">
        <xs:annotation>
            <xs:documentation>
                Schema version attribute can contain only [0-9.].
            </xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern value="[0-9.]+" />
        </xs:restriction>
    </xs:simpleType>
</xs:schema>