Odoo-18.0-20251222/base_view_inheritance_extension/readme/USAGE.md

Change a python dictionary (context for example)

<field position="attributes">
    <attribute name="context" operation="update">
        {
            "key": "value",
        }
    </attribute>
</field>

Note that views are subject to evaluation of xmlids anyways, so if you need to refer to some xmlid, say %(xmlid)s.

Add text after and/or before than original

<attribute name="$attribute" operation="text_add">
    $text_before {old_value} $text_after
</attribute>

Add domain with AND/OR join operator (AND if missed) allowing conditional changes

<attribute name="$attribute" operation="domain_add"
           condition="$field_condition" join_operator="OR">
    $domain_to_add
</attribute>