<?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="report" type="reportDeclaration" minOccurs="0" maxOccurs="unbounded" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:complexType name="reportDeclaration">
        <xs:sequence>
            <xs:element name="source" type="sourceDeclaration" minOccurs="1" maxOccurs="1" />
            <xs:any minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="connection" type="xs:string"/>
        <xs:attribute name="iterator" type="xs:string"/>
    </xs:complexType>
    <xs:complexType name="sourceDeclaration">
        <xs:choice minOccurs="1" maxOccurs="unbounded">
            <xs:element name="attribute" type="attributeDeclaration" minOccurs="1" maxOccurs="unbounded" />
            <xs:element name="link-source" type="linkSourceDeclaration" minOccurs="0" maxOccurs="61" />
            <xs:element name="filter" type="filterDeclaration" minOccurs="0" maxOccurs="unbounded" />
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="alias" type="xs:string"/>
    </xs:complexType>
    <xs:complexType name="linkSourceDeclaration">
        <xs:choice minOccurs="1" maxOccurs="unbounded">
            <xs:element name="attribute" type="attributeDeclaration" minOccurs="0" maxOccurs="unbounded" />
            <xs:element name="filter" type="filterDeclaration" minOccurs="0" maxOccurs="unbounded" />
            <xs:element name="using" type="filterDeclaration" minOccurs="1" maxOccurs="unbounded" />
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="alias" type="xs:string"/>
        <xs:attribute name="link-type" type="xs:string"/>
    </xs:complexType>
    <xs:complexType name="attributeDeclaration">
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="alias" type="xs:string"/>
        <xs:attribute name="function" type="functionDeclaration"/>
        <xs:attribute name="group" type="xs:boolean" default="false"/>
        <xs:attribute name="distinct" type="xs:boolean" default="false"/>
    </xs:complexType>
    <xs:complexType name="filterDeclaration">
        <xs:choice minOccurs="1" maxOccurs="unbounded">
            <xs:element name="filter" type="filterDeclaration"  minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="condition" type="conditionDeclaration" minOccurs="1" maxOccurs="unbounded" />
        </xs:choice>
        <xs:attribute name="glue" type="glueType" default="and" />
    </xs:complexType>
    <xs:complexType name="conditionDeclaration" mixed="true">
        <xs:attribute name="attribute" type="xs:string" use="required" />
        <xs:attribute name="operator" type="xs:string" use="required" />
        <xs:attribute name="type" type="valueType" default="value" />
    </xs:complexType>
    <xs:simpleType name="valueType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="value" />
            <xs:enumeration value="variable" />
            <xs:enumeration value="identifier" />
        </xs:restriction>
    </xs:simpleType>
    <xs:simpleType name="functionDeclaration">
        <xs:restriction base="xs:string">
            <xs:enumeration value="count" />
            <xs:enumeration value="lower" />
            <xs:enumeration value="date" />
            <xs:enumeration value="sum" />
            <xs:enumeration value="max" />
            <xs:enumeration value="avg" />
            <xs:enumeration value="min" />
            <xs:enumeration value="sha1" />
        </xs:restriction>
    </xs:simpleType>
    <xs:simpleType name="glueType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="and" />
            <xs:enumeration value="or" />
        </xs:restriction>
    </xs:simpleType>
</xs:schema>