问PyXB向生成的Python类添加anyAttribute属性

EN

<xs:element name="person">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="firstname" type="xs:string"/>
      <xs:element name="lastname" type="xs:string"/>
    </xs:sequence>
    <xs:anyAttribute/>
  </xs:complexType>
</xs:element>

import person

p = person()
p.firstname = 'bob'
p.lastname  = 'bobbington'

#I want behavior like this
p.middlename = 'bobby'

#I would settle for behavior like this:
p.add_attribute( 'middlename', 'bobby' )

#Heck*, I'd even settle for:
temp_attr = pyxb.AttributeUse( name, value, blah, blah, blay )
p._AttributeMap.update( temp_attr.name(), temp_attr )

class PersonType():
    '''
    regular generated PersonType stuff here
    '''
    def add_attribute(self, name, value):
        t = pyxb.blahblahblah._AttributeUse(
            pyxb.blahblahblah._ExtendedName( None, attr_name),
            attr_name,
            pyxb.blahblah.StringDataType)
        t.setValue(self, value)  # or maybe _setValue
        self._AttributeMap[t.name()] = t