magento-test/lib/internal/Magento/Framework/View/Layout/etc/head.xsd

<?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:complexType name="linkType">
        <xs:attribute name="src" type="xs:string" use="required"/>
        <xs:attribute name="defer" type="xs:string"/>
        <xs:attribute name="ie_condition" type="xs:string"/>
        <xs:attribute name="charset" type="xs:string"/>
        <xs:attribute name="hreflang" type="xs:string"/>
        <xs:attribute name="media" type="xs:string"/>
        <xs:attribute name="rel" type="xs:string"/>
        <xs:attribute name="rev" type="xs:string"/>
        <xs:attribute name="sizes" type="xs:string"/>
        <xs:attribute name="target" type="xs:string"/>
        <xs:attribute name="type" type="xs:string"/>
        <xs:attribute name="order" type="xs:integer"/>
        <xs:attribute name="src_type" type="xs:string"/>
        <xs:attribute name="as">
            <xs:simpleType>
                <xs:restriction base="xs:string">
                    <xs:enumeration value="font" />
                    <xs:enumeration value="script" />
                    <xs:enumeration value="style" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>

    <xs:complexType name="metaType">
        <xs:attribute name="content" type="xs:string" use="required"/>
        <xs:attribute name="charset" type="xs:string" />
        <xs:attribute name="http-equiv" type="xs:string"/>
        <xs:attribute name="name" type="xs:string"/>
        <xs:attribute name="scheme" type="xs:string"/>
    </xs:complexType>

    <xs:complexType name="scriptType">
        <xs:attribute name="src" type="xs:string" use="required"/>
        <xs:attribute name="defer" type="xs:string"/>
        <xs:attribute name="ie_condition" type="xs:string"/>
        <xs:attribute name="async" type="xs:string"/>
        <xs:attribute name="charset" type="xs:string"/>
        <xs:attribute name="type" type="xs:string"/>
        <xs:attribute name="src_type" type="xs:string"/>
    </xs:complexType>

    <xs:complexType name="headAttributeType">
        <xs:attribute type="xs:string" name="name"/>
        <xs:attribute type="xs:string" name="value"/>
    </xs:complexType>

    <xs:complexType name="srcRemoveType">
        <xs:attribute name="src" type="xs:string" use="required"/>
    </xs:complexType>

    <xs:complexType name="headType">
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="title" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="css" type="linkType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="link" type="linkType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="meta" type="metaType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="script" type="scriptType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="remove" type="srcRemoveType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="attribute" type="headAttributeType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="font" type="linkType" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
</xs:schema>