/Html/How to add the phtml using xml magento 2

How to add the phtml using xml magento 2

<referenceContainer name="after.body.start">
    <block class="Magento\Framework\View\Element\Template" 
           name="custom.file" 
           before="-" 
           template="Magento_Theme::html/custom.phtml"
    />
</referenceContainer>

Source: magento.stackexchange.com

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