<?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="file" type="fileDeclaration" minOccurs="0" maxOccurs="unbounded" />
            </xs:sequence>
        </xs:complexType>
        <xs:unique name="uniqueFileName">
            <xs:selector xpath="file" />
            <xs:field xpath="@name" />
        </xs:unique>
    </xs:element>
    <xs:complexType name="fileDeclaration">
        <xs:sequence>
            <xs:element name="providers" type="providers" minOccurs="1" />
        </xs:sequence>
        <xs:attribute name="name" type="fileName" use="required" />
        <xs:attribute name="prefix" type="xs:string" />
    </xs:complexType>
    <xs:complexType name="providers">
        <xs:choice>
            <xs:sequence>
                <xs:element name="reportProvider" type="reportProvider" />
                <xs:element name="customProvider" type="customProvider" minOccurs="0" />
            </xs:sequence>
            <xs:element name="customProvider" type="customProvider" />
        </xs:choice>
    </xs:complexType>
    <xs:complexType name="provider" abstract="true">
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="class" type="xs:string" use="required"/>
    </xs:complexType>
    <xs:complexType name="reportProvider">
        <xs:complexContent>
            <xs:extension base="provider">
                <xs:all>
                    <xs:element name="parameters">
                        <xs:complexType>
                            <xs:sequence>
                                <xs:element name="name" type="notEmptyString" maxOccurs="1" />
                            </xs:sequence>
                        </xs:complexType>
                    </xs:element>
                </xs:all>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
    <xs:complexType name="customProvider">
        <xs:complexContent>
            <xs:extension base="provider" />
        </xs:complexContent>
    </xs:complexType>
    <xs:simpleType name="fileName">
        <xs:annotation>
            <xs:documentation>
                File name attribute can has only [a-zA-Z0-9/_].
            </xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z0-9/_]+" />
        </xs:restriction>
    </xs:simpleType>
    <xs:simpleType name="notEmptyString">
        <xs:annotation>
            <xs:documentation>
                Value is required.
            </xs:documentation>
        </xs:annotation>
        <xs:restriction base="xs:string">
            <xs:minLength value="1" />
        </xs:restriction>
    </xs:simpleType>
</xs:schema>