Is it posssible to apply a part domain only when some condition is true otherwise the part domain should not be applied?

For example (extremely simplified this example):

xxx = fields.Boolean('XXX')

<field name="xxx"/>
<field name="yyy_ids" widget="many2many" domain="['|',(False,'=',xxx),(False,'!=',xxx) ]">

Example result: ValueError: Invalid leaf [False, '=', True]

otherwise writing, I need:

if xxx:
    <field name="yyy_ids" widget="many2many"  domain="[...version1....]"/>
else:
    <field name="yyy_ids" widget="many2many"  domain="[...version2....]"/>

UPDATE, SOLUTION:

    @api.model    
    def fields_view_get(self, view_id=None, view_type=False, context=None, toolbar=False, submenu=False):
        res = super(my_model, self).fields_view_get(view_id=view_id, view_type=view_type, context=context, toolbar=toolbar, submenu=submenu)
        doc = etree.XML(res['arch'])
        nodes = doc.xpath("//field[@name='yyy_ids']")

     
        ### if self.xxx:  ### This solution does not work !!!   
 
        if 'xxx' in self._context:  ### this only works
            for node in nodes:
                node.set('domain', "....version1....")
        else:   
            for node in nodes:
                node.set('domain', "....version2....")
        res['arch'] = etree.tostring(doc)
        return res