Log4j-config.xsd

<?xml version="1.0" encoding="UTF-8"?>
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      http://www.apache.org/licenses/LICENSE-2.0

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<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
    <xs:element name="Configuration" type="ConfigurationType"/>
    <xs:complexType name="ConfigurationType">
        <xs:sequence>
            <xs:element name="Properties" type="PropertiesType"/>
            <xs:choice minOccurs="0" maxOccurs="1">
                <xs:element name="Filters" type="FiltersType"/>
                <xs:element name="Filter" type="FilterType"/>
            </xs:choice>
            <xs:element name="ThresholdFilter" type="ThresholdFilterType"/>
            <xs:element name="Appenders" type="AppendersType"/>
            <xs:element name="Loggers" type="LoggersType"/>
        </xs:sequence>
        <xs:attribute name="packages" type="xs:string"/>
        <xs:attribute name="status" type="xs:string"/>
        <xs:attribute name="strict" type="xs:string"/>
        <xs:attribute name="name" type="xs:string"/>
        <xs:attribute name="advertiser" type="xs:string"/>
    </xs:complexType>
    <xs:complexType name="PropertiesType">
        <xs:sequence>
            <xs:element name="Property" type="PropertyType"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="AppenderType">
        <xs:sequence>
            <xs:element name="Layout" type="LayoutType" minOccurs="0"/>
            <xs:choice minOccurs="0" maxOccurs="1">
                <xs:element name="Filters" type="FiltersType"/>
                <xs:element name="Filter" type="FilterType"/>
            </xs:choice>
        </xs:sequence>
        <xs:attribute name="type" type="xs:string" use="required"/>
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="fileName" type="xs:string" use="optional"/>
    </xs:complexType>
    <xs:complexType name="RootType">
        <xs:sequence>
            <xs:element name="AppenderRef" type="AppenderRefType" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="level" type="xs:string"/>
    </xs:complexType>
    <xs:complexType name="PropertyType">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="name" type="xs:string"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    <xs:complexType name="KeyValuePairType">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="key" type="xs:string"/>
                <xs:attribute name="value" type="xs:string"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    <xs:complexType name="AppendersType">
        <xs:sequence>
            <xs:element name="Appender" type="AppenderType" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="AppenderRefType">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="ref" type="xs:string" use="required"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
    <xs:complexType name="LoggerType">
        <xs:sequence>
            <xs:choice minOccurs="0" maxOccurs="1">
                <xs:element name="Filters" type="FiltersType"/>
                <xs:element name="Filter" type="FilterType"/>
            </xs:choice>
            <xs:element name="AppenderRef" type="AppenderRefType"/>
        </xs:sequence>
        <xs:attribute name="name" type="xs:string" use="required"/>
        <xs:attribute name="level" type="xs:string" use="optional"/>
        <xs:attribute name="additivity" type="xs:string" use="optional"/>
    </xs:complexType>
    <xs:complexType name="FilterType" mixed="true">
        <xs:sequence>
            <xs:element name="KeyValuePair" type="KeyValuePairType" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="type" type="xs:string" use="required"/>
        <xs:attribute name="level" type="xs:string" use="optional"/>
        <xs:attribute name="marker" type="xs:string" use="optional"/>
        <xs:attribute name="onMatch" type="xs:string" use="optional"/>
        <xs:attribute name="onMismatch" type="xs:string" use="optional"/>
    </xs:complexType>
    <xs:complexType name="FiltersType">
        <xs:sequence>
            <xs:element name="Filter" type="FilterType" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="LoggersType" mixed="true">
        <xs:sequence>
            <xs:element name="Logger" type="LoggerType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="Root" type="RootType" minOccurs="1" maxOccurs="1"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="LayoutType" mixed="true">
        <xs:sequence>
            <xs:element name="Pattern" type="xs:string" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="Type" type="xs:string" use="required"/>
        <xs:attribute name="Pattern" type="xs:string" use="optional"/>
    </xs:complexType>
    <xs:complexType name="ThresholdFilterType">
        <xs:attribute name="level" type="xs:string" use="optional"/>
        <xs:attribute name="onMatch" type="xs:string" use="optional"/>
        <xs:attribute name="onMismatch" type="xs:string" use="optional"/>
    </xs:complexType>
</xs:schema>