server-tools/base_view_inheritance_exten.../readme/USAGE.rst

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**Change a python dictionary (context for example)**
.. code-block:: xml
<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``.