example.xml

<!-- Schema based definition -->
<Type name="Text" schema="https://html-the-programming-language.com/type/Text"/>
<Type name="Collection" schema="https://html-the-programming-language.com/type/Collection"/>
<Type name="Number" schema="https://html-the-programming-language.com/type/Number"/>

<!-- Custom type -->
<Type name="User">
    <FieldSet>
        <FieldRule name="name" type="Text"/>
        <FieldRule name="roles" type="Collection"/>
    </FieldSet>
</Type>

<!-- Variable declaration -->
<Variable name="user" type="User">
    <Fields>
        <Field name="name" value="Kamil"/>
        <Field name="roles">
            <Value>admin</Value>
            <Value>manager</Value>
        </Field>
    </Fields>
</Variable>

<!-- Schema based conditions -->
<Condition id="contains" schema="https://html-the-programming-language.com/condition/contains"/>

<!-- Conditional statements -->
<If var="user.roles" condition="#contains" arg="admin">
    <IfTrue>
        <p>Czesc admin <Variable name="user" property="name" role="display"/>!</p>
    </IfTrue>
    <IfFalse>
        <p>Czesc <Variable name="user" property="name" role="display"/>!</p>
    </IfFalse>
</If>

<!-- Math -->
<Variable name="num" type="Number"/>
<Calculate action="plus" store="num">
    <Operand>1</Operand>
    <Operand>2</Operand>
</Calculate>
<p>Wynik obliczenia 1+2 to: <Variable name="num" role="display"/></p>