XSD based Autocompletion for substitutionGroup

[shubham-m]

Sample XSD - bookstore.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

    <!-- ELEMENT DECLARATIONS -->

    <xsd:element name="Name" type="xsd:string" />
    <xsd:element name="StoreName" substitutionGroup="Name" type="MyString" />

    <xsd:element name="Publication" type="PublicationType" />
    <xsd:element name="Book" substitutionGroup="Publication" type="BookType" />
    <xsd:element name="Magazine" substitutionGroup="Publication" type="MagazineType" />

    <xsd:element name="BookStore">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="Name" />
                <xsd:element ref="Publication" maxOccurs="unbounded" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

    <xsd:element name="LiteratureStore" substitutionGroup="BookStore" />


    <!--  TYPE DEFINITIONS -->

    <xsd:simpleType name="MyString">
        <xsd:restriction base="xsd:string">
            <xsd:minLength value="3"></xsd:minLength>
            <xsd:maxLength value="10"></xsd:maxLength>
        </xsd:restriction>
    </xsd:simpleType>

    <xsd:complexType name="PublicationType">
        <xsd:sequence>
            <xsd:element name="Title" type="xsd:string" />
            <xsd:element name="Author" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
            <xsd:element name="Date" type="xsd:gYear" />
        </xsd:sequence>
    </xsd:complexType>

    <xsd:complexType name="BookType">
        <xsd:complexContent>
            <xsd:extension base="PublicationType">
                <xsd:sequence>
                    <xsd:element name="ISBN" type="xsd:string" />
                    <xsd:element name="Publisher" type="xsd:string" />
                </xsd:sequence>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:complexType name="MagazineType">
        <xsd:complexContent>
            <xsd:restriction base="PublicationType">
                <xsd:sequence>
                    <xsd:element name="Title" type="xsd:string" />
                    <xsd:element name="Date" type="xsd:gYear" />
                </xsd:sequence>
            </xsd:restriction>
        </xsd:complexContent>
    </xsd:complexType>

</xsd:schema>

Here Book extends Publication, but for auto complete the elements inside Book are not shown in autocomplete.

The quick fix tooltip is suggesting the elements but auto complete is not providing them. Clicking on Quick fix is also not helping

[angelozerr]

@shubham-m could you share please your xml.

[shubham-m]

Sample XML to reproduce the problem. bookstore.xml ->

<?xml version="1.0" encoding="UTF-8"?>
<BookStore 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="bookstore.xsd">
    <StoreName>ABC Store</StoreName>
    <Publication>
        <Title>Book1</Title>
        <Author>Author1</Author>
        <!-- Autocomplete works here on the base element, try adding another author -->
        <Date>2022</Date>
    </Publication>
    <!-- VSCode Redhat XML plugin shows error here at book element -->
    <Book>
        <!-- Unable to add elements here using auto complete -->
    </Book>
</BookStore>

[angelozerr]

@shubham-m I created a PR to fix this issue. See demo at eclipse-lemminx/lemminx#1386 (comment)