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[EDIT] FILE: phpcs.xsd

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" attributeFormDefault="unqualified" elementFormDefault="qualified">

<xs:element name="ruleset">
        <xs:complexType>
            <xs:choice minOccurs="0" maxOccurs="unbounded">
                <xs:element name="description" type="xs:string" maxOccurs="1" minOccurs="0"></xs:element>
                <xs:element name="config" maxOccurs="unbounded" minOccurs="0">
                    <xs:complexType>
                        <xs:attribute name="name" type="xs:string" use="required"></xs:attribute>
                        <xs:attribute name="value" type="xs:string" use="required"></xs:attribute>
                        <xs:attributeGroup ref="applySelectively"/>
                    </xs:complexType>
                </xs:element>
                <xs:element name="file" maxOccurs="unbounded" minOccurs="0">
                    <xs:complexType>
                        <xs:simpleContent>
                            <xs:extension base="xs:string">
                                <xs:attributeGroup ref="applySelectively"/>
                            </xs:extension>
                        </xs:simpleContent>
                    </xs:complexType>
                </xs:element>
                <xs:element name="exclude-pattern" type="patternType" maxOccurs="unbounded" minOccurs="0"></xs:element>
                <xs:element name="arg" maxOccurs="unbounded" minOccurs="0">
                    <xs:complexType>
                        <xs:attribute name="name" type="xs:string"></xs:attribute>
                        <xs:attribute name="value" type="xs:string"></xs:attribute>
                        <xs:attributeGroup ref="applySelectively"/>
                    </xs:complexType>
                </xs:element>
                <xs:element name="ini" maxOccurs="unbounded" minOccurs="0">
                    <xs:complexType>
                        <xs:attribute name="name" type="xs:string" use="required"></xs:attribute>
                        <xs:attribute name="value" type="xs:string" use="required"></xs:attribute>
                        <xs:attributeGroup ref="applySelectively"/>
                    </xs:complexType>
                </xs:element>
                <xs:element name="autoload" type="xs:string" maxOccurs="unbounded" minOccurs="0"></xs:element>
                <xs:element name="rule" type="ruleType" maxOccurs="unbounded" minOccurs="0"></xs:element>
            </xs:choice>
            <xs:attribute name="name" type="xs:string"></xs:attribute>
            <xs:attribute name="namespace" type="xs:string"></xs:attribute>
        </xs:complexType>
    </xs:element>

<xs:complexType name="ruleType">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element name="exclude" maxOccurs="unbounded" minOccurs="0">
                <xs:complexType>
                    <xs:attribute name="name" type="xs:string" use="required"></xs:attribute>
                    <xs:attributeGroup ref="applySelectively"/>
                </xs:complexType>
            </xs:element>
            <xs:element name="message" type="xs:string" maxOccurs="1" minOccurs="0"></xs:element>
            <xs:element name="severity" maxOccurs="1" minOccurs="0">
                <xs:complexType>
                    <xs:simpleContent>
                        <xs:extension base="xs:integer">
                            <xs:attributeGroup ref="applySelectively"/>
                        </xs:extension>
                    </xs:simpleContent>
                </xs:complexType>
            </xs:element>
            <xs:element name="type" maxOccurs="1" minOccurs="0">
                <xs:complexType>
                    <xs:simpleContent>
                        <xs:extension base="messageType">
                            <xs:attributeGroup ref="applySelectively"/>
                        </xs:extension>
                    </xs:simpleContent>
                </xs:complexType>
            </xs:element>
            <xs:element name="exclude-pattern" type="patternType" maxOccurs="unbounded" minOccurs="0"></xs:element>
            <xs:element name="include-pattern" type="patternType" maxOccurs="unbounded" minOccurs="0"></xs:element>
            <xs:element name="properties" type="propertiesType" maxOccurs="1" minOccurs="0"></xs:element>
        </xs:choice>
        <xs:attribute name="ref" type="xs:string" use="required"></xs:attribute>
        <xs:attributeGroup ref="applySelectively"/>
    </xs:complexType>

<xs:complexType name="patternType">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="type">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="relative"></xs:enumeration>
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>
                <xs:attributeGroup ref="applySelectively"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

<xs:complexType name="propertiesType">
        <xs:sequence>
            <xs:element name="property" maxOccurs="unbounded" minOccurs="1">
                <xs:complexType>
                    <xs:sequence>
                        <xs:element name="element" maxOccurs="unbounded" minOccurs="0">
                            <xs:complexType>
                                <xs:attribute name="key" type="xs:string"></xs:attribute>
                                <xs:attribute name="value" type="xs:string" use="required"></xs:attribute>
                            </xs:complexType>
                        </xs:element>
                    </xs:sequence>
                    <xs:attribute name="type">
                        <xs:simpleType>
                            <xs:restriction base="xs:string">
                                <xs:enumeration value="array"></xs:enumeration>
                            </xs:restriction>
                        </xs:simpleType>
                    </xs:attribute>
                    <xs:attribute name="name" type="xs:string" use="required"></xs:attribute>
                    <xs:attribute name="value" type="xs:string"></xs:attribute>
                    <xs:attribute name="extend" type="xs:boolean" default="false"/>
                    <xs:attributeGroup ref="applySelectively"/>
                </xs:complexType>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

<xs:simpleType name="messageType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="error"></xs:enumeration>
            <xs:enumeration value="warning"></xs:enumeration>
        </xs:restriction>
    </xs:simpleType>

<xs:attributeGroup name="applySelectively">
        <xs:attribute name="phpcs-only" type="xs:boolean" default="false"/>
        <xs:attribute name="phpcbf-only" type="xs:boolean" default="false"/>
    </xs:attributeGroup>
</xs:schema>

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