elements.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">
    <!-- Redefine section -->
    <xs:redefine schemaLocation="urn:magento:framework:Data/etc/argument/types.xsd">
        <xs:complexType name="argumentType" abstract="true" mixed="true">
            <xs:complexContent>
                <xs:extension base="argumentType">
                    <xs:sequence>
                        <xs:element name="updater" type="updaterType" minOccurs="0" maxOccurs="1"/>
                    </xs:sequence>
                </xs:extension>
            </xs:complexContent>
        </xs:complexType>
    </xs:redefine>
    <!-- Defined the types of elements -->

    <!-- Elements -->
    <xs:element type="blockType" name="block">
        <xs:annotation>
            <xs:documentation>
                Argument name must be unique in scope of block.
            </xs:documentation>
        </xs:annotation>
        <xs:key name="blockArgumentName">
            <xs:selector xpath="./arguments/argument"></xs:selector>
            <xs:field xpath="@name"></xs:field>
        </xs:key>
    </xs:element>

    <xs:element type="blockReferenceType" name="referenceBlock">
        <xs:annotation>
            <xs:documentation>
                Argument name must be unique in scope of reference.
            </xs:documentation>
        </xs:annotation>
        <xs:unique name="referenceBlockArgumentName">
            <xs:selector xpath="./arguments/argument"></xs:selector>
            <xs:field xpath="@name"></xs:field>
        </xs:unique>
    </xs:element>

    <xs:element type="containerReferenceType" name="referenceContainer"/>

    <xs:element type="uiComponentType" name="uiComponent">
        <xs:annotation>
            <xs:documentation>
                Argument name must be unique in scope of all Blocks, Containers and other UI Components.
            </xs:documentation>
        </xs:annotation>
        <xs:key name="uiElementArgumentName">
            <xs:selector xpath="./argument"/>
            <xs:field xpath="@name"/>
        </xs:key>
    </xs:element>

    <xs:element name="arguments" type="argumentsType"/>

    <xs:element name="update" type="updateType"/>

    <xs:element name="remove" type="removeType"/>

    <xs:element name="move" type="moveType"/>

    <!-- Simple types -->
    <xs:simpleType name="handlePageType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="page"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="componentNameType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z][a-zA-Z\d\-_\.]*"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="elementNameType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z0-9][a-zA-Z\d\-_\.]*"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="elementAliasType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z][a-zA-Z\d\-_\.]*"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="elementPositionType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z][a-zA-Z\d\-_\.]*|-"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="elementOutputType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="1"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="htmlIdentifierType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z][a-zA-Z\d\-_:]*"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="htmlClassType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z][a-zA-Z\d\-_]*(\s[a-zA-Z][a-zA-Z\d\-_]*)*"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="htmlTagType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="aside"/>
            <xs:enumeration value="dd"/>
            <xs:enumeration value="div"/>
            <xs:enumeration value="dl"/>
            <xs:enumeration value="fieldset"/>
            <xs:enumeration value="main"/>
            <xs:enumeration value="nav"/>
            <xs:enumeration value="header"/>
            <xs:enumeration value="footer"/>
            <xs:enumeration value="ol"/>
            <xs:enumeration value="p"/>
            <xs:enumeration value="section"/>
            <xs:enumeration value="table"/>
            <xs:enumeration value="tfoot"/>
            <xs:enumeration value="ul"/>
        </xs:restriction>
    </xs:simpleType>

    <xs:simpleType name="blockClassType">
        <xs:restriction base="xs:string">
            <xs:pattern value="[A-Z][_a-zA-Z\d]*(\\[A-Z][_a-zA-Z\d]*)*"/>
        </xs:restriction>
    </xs:simpleType>

    <!-- Complex types -->
    <xs:complexType name="containerType">
        <xs:annotation>
            <xs:documentation>
                Container for structuring elements of a page.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element ref="block" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="container" type="containerType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="referenceBlock" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="referenceContainer" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="uiComponent" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute type="elementNameType" name="name"/>
        <xs:attribute type="xs:string" name="label"/>
        <xs:attribute type="elementOutputType" name="output"/>
        <xs:attribute type="elementAliasType" name="as"/>
        <xs:attribute type="elementPositionType" name="after"/>
        <xs:attribute type="elementPositionType" name="before"/>
        <xs:attribute type="htmlTagType" name="htmlTag"/>
        <xs:attribute type="htmlClassType" name="htmlClass"/>
        <xs:attribute type="htmlIdentifierType" name="htmlId"/>
    </xs:complexType>

    <xs:complexType name="blockType" mixed="true">
        <xs:annotation>
            <xs:documentation>
                Part of view that can generate appropriate content.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence minOccurs="0" maxOccurs="unbounded">
            <xs:element name="action" type="actionType" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Argument name must be unique in scope of action.
                    </xs:documentation>
                </xs:annotation>
                <xs:key name="blockActionArgumentName">
                    <xs:selector xpath="argument"></xs:selector>
                    <xs:field xpath="@name"></xs:field>
                </xs:key>
            </xs:element>
            <xs:element ref="arguments" minOccurs="0" maxOccurs="1"/>
            <xs:element ref="block" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="container" type="containerType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="referenceBlock" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="uiComponent" minOccurs="0" />
        </xs:sequence>
        <xs:attribute type="elementNameType" name="name" use="optional"/>
        <xs:attribute type="blockClassType" name="class" use="optional"/>
        <xs:attribute type="elementAliasType" name="as" use="optional"/>
        <xs:attribute type="xs:string" name="template" use="optional"/>
        <xs:attribute type="elementPositionType" name="before" use="optional"/>
        <xs:attribute type="elementPositionType" name="after" use="optional"/>
        <xs:attribute type="elementOutputType" name="output" use="optional"/>
        <xs:attribute type="xs:string" name="acl" use="optional"/>
        <xs:attribute type="xs:string" name="aclResource" use="optional"/>
        <xs:attribute type="xs:string" name="ifconfig" use="optional"/>
        <xs:attribute type="xs:string" name="group" use="optional" />
        <xs:attribute type="xs:boolean" name="cacheable" default="true" use="optional"/>
        <xs:attribute type="xs:int" name="ttl" use="optional"/>
    </xs:complexType>

    <xs:complexType name="uiComponentType" mixed="true">
        <xs:annotation>
            <xs:documentation>
                Part of view that can generate appropriate content.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence>
            <xs:element name="argument" type="argumentType" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element name="visibilityCondition" type="visibilityConditionType" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute type="componentNameType" name="component" use="optional"/>
        <xs:attribute type="elementNameType" name="name" use="optional"/>
        <xs:attribute type="elementAliasType" name="as" use="optional"/>
        <xs:attribute type="elementPositionType" name="before" use="optional"/>
        <xs:attribute type="elementPositionType" name="after" use="optional"/>
        <xs:attribute type="elementOutputType" name="output" use="optional"/>
        <xs:attribute type="xs:string" name="aclResource" use="optional"/>
        <xs:attribute type="xs:string" name="ifconfig" use="optional"/>
        <xs:attribute type="xs:string" name="group" use="optional" />
        <xs:attribute type="xs:boolean" name="cacheable" default="true" use="optional"/>
        <xs:attribute type="xs:int" name="ttl" use="optional"/>
    </xs:complexType>

    <xs:complexType name="actionType">
        <xs:annotation>
            <xs:documentation>
                Call public PHP methods of the block class.
            </xs:documentation>
        </xs:annotation>
        <xs:sequence>
            <xs:element name="argument" type="argumentType" minOccurs="0" maxOccurs="unbounded">
                <xs:key name="actionArgumentItemName">
                    <xs:selector xpath="item"></xs:selector>
                    <xs:field xpath="@name"></xs:field>
                </xs:key>
            </xs:element>
        </xs:sequence>
        <xs:attribute type="xs:string" name="method" use="required"/>
        <xs:attribute type="xs:string" name="ifconfig" use="optional"/>
    </xs:complexType>

    <xs:complexType name="visibilityConditionType">
        <xs:annotation>
            <xs:documentation>
                Apply visibility rules.
            </xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element ref="arguments" minOccurs="0" maxOccurs="1"/>
        </xs:choice>
        <xs:attribute type="xs:string" name="name" use="required"/>
        <xs:attribute type="xs:string" name="className" use="required"/>
    </xs:complexType>

    <xs:complexType name="updateType">
        <xs:annotation>
            <xs:documentation>
                Include another Handle's tags.
            </xs:documentation>
        </xs:annotation>
        <xs:attribute type="xs:string" name="handle" use="required"/>
    </xs:complexType>

    <xs:complexType name="removeType">
        <xs:annotation>
            <xs:documentation>
                Remove Element directive.
            </xs:documentation>
        </xs:annotation>
        <xs:attribute type="elementNameType" name="name" use="required"/>
    </xs:complexType>

    <xs:complexType name="moveType">
        <xs:annotation>
            <xs:documentation>
                Move Element directive.
            </xs:documentation>
        </xs:annotation>
        <xs:attribute type="elementNameType" name="element" use="required"/>
        <xs:attribute type="elementNameType" name="destination" use="required"/>
        <xs:attribute type="elementAliasType" name="as" use="optional"/>
        <xs:attribute type="elementPositionType" name="after" use="optional"/>
        <xs:attribute type="elementPositionType" name="before" use="optional"/>
    </xs:complexType>

    <xs:complexType name="blockReferenceType" mixed="true">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element name="action" type="actionType" minOccurs="0" maxOccurs="unbounded">
                <xs:annotation>
                    <xs:documentation>
                        Argument name must be unique in scope of action.
                    </xs:documentation>
                </xs:annotation>
                <xs:key name="blockReferenceActionArgumentName">
                    <xs:selector xpath="argument"></xs:selector>
                    <xs:field xpath="@name"></xs:field>
                </xs:key>
            </xs:element>
            <xs:element ref="arguments" minOccurs="0" maxOccurs="1"/>
            <xs:element ref="block" minOccurs="0"/>
            <xs:element name="container" type="containerType" minOccurs="0"/>
            <xs:element ref="referenceBlock" minOccurs="0" />
            <xs:element ref="referenceContainer" minOccurs="0"/>
            <xs:element ref="uiComponent" minOccurs="0" />
        </xs:choice>
        <xs:attribute type="elementNameType" name="name" use="required"/>
        <xs:attribute type="xs:string" name="template" use="optional"/>
        <xs:attribute type="xs:boolean" name="display" default="true" use="optional"/>
        <xs:attribute type="xs:boolean" name="remove" use="optional"/>
        <xs:attribute type="xs:string" name="htmlClass" use="optional"/>
    </xs:complexType>

    <xs:complexType name="containerReferenceType" mixed="true">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element ref="referenceContainer" minOccurs="0" />
            <xs:element ref="block" minOccurs="0" />
            <xs:element name="container" type="containerType" minOccurs="0" />
            <xs:element ref="referenceBlock" minOccurs="0" />
            <xs:element ref="uiComponent" minOccurs="0" />
        </xs:choice>
        <xs:attribute type="elementNameType" name="name" use="required"/>
        <xs:attribute type="htmlTagType" name="htmlTag"/>
        <xs:attribute type="htmlClassType" name="htmlClass"/>
        <xs:attribute type="htmlIdentifierType" name="htmlId"/>
        <xs:attribute type="xs:string" name="label"/>
        <xs:attribute type="xs:boolean" name="display" default="true" use="optional"/>
        <xs:attribute type="xs:boolean" name="remove" use="optional"/>
    </xs:complexType>

    <xs:complexType name="options">
        <xs:complexContent>
            <xs:extension base="argumentType">
                <xs:attribute name="model" use="required"/>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="url" mixed="true">
        <xs:complexContent>
            <xs:extension base="argumentType">
                <xs:sequence minOccurs="0">
                    <xs:element name="param" minOccurs="0" maxOccurs="unbounded">
                        <xs:complexType mixed="true">
                            <xs:attribute name="name" type="xs:string" use="required"/>
                        </xs:complexType>
                    </xs:element>
                </xs:sequence>
                <xs:attribute name="path" use="required"/>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="serviceUrl" mixed="true">
        <xs:complexContent>
            <xs:extension base="argumentType">
                <xs:sequence minOccurs="0">
                    <xs:element name="param" minOccurs="0" maxOccurs="unbounded">
                        <xs:complexType mixed="true">
                            <xs:attribute name="name" type="xs:string" use="required"/>
                        </xs:complexType>
                    </xs:element>
                </xs:sequence>
                <xs:attribute name="path" use="required"/>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="helper" mixed="true">
        <xs:complexContent>
            <xs:extension base="argumentType">
                <xs:sequence minOccurs="0">
                    <xs:element name="param" minOccurs="0" maxOccurs="unbounded">
                        <xs:complexType mixed="true">
                            <xs:attribute name="name" type="xs:string" use="required"/>
                        </xs:complexType>
                    </xs:element>
                </xs:sequence>
                <xs:attribute name="helper" use="required"/>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="updaterType">
        <xs:annotation>
            <xs:documentation>
                Argument updater.
            </xs:documentation>
        </xs:annotation>
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute type="xs:integer" name="sortOrder" use="optional"/>
                <xs:attribute type="xs:string" name="enabled" use="optional"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:schema>

/www/vendor/magento/framework/View/Layout/etc/elements.xsd