I am trying to speak to a SOAP server of which I received a WSDL files and multiple XSD files. The python module I am using for that is zeep 4.2.1 with python 3.12. When I call a service, I get an error message that one of my attributes is not valid.

How can I specify the codingScheme as ‘A10’ without getting the ValidationError?

This is the code I use to call a service:

parameters = {
  ...
  'sender_MarketParticipant.mRID': {'_value_1': 'EAN', 'codingScheme': 'A10'},
  ...
}
return service.sendSchedule(**parameters)

This is the error that I get:

ValidationError: The attribute codingScheme is not valid: Value is required (Schedule_MarketDocument.domain.mRID.codingScheme)

This is how the final XML should look like:

...
<sender_MarketParticipant.mRID codingScheme="A10">EAN</sender_MarketParticipant.mRID>
...

There is a lot of information in the WSDL and XSD files. I will include some snippets that might be relevant.

  <xs:complexType name="Schedule_MarketDocument" sawsdl:modelReference="http://iec.ch/TC57/2013/CIM-schema-cim16#MarketDocument">
    <xs:sequence>
      ...
      <xs:element name="sender_MarketParticipant.mRID" type="PartyID_String" minOccurs="1" maxOccurs="1" sawsdl:modelReference="http://iec.ch/TC57/2013/CIM-schema-cim16#IdentifiedObject.mRID"/>
      ...
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="PartyID_String" sawsdl:modelReference="http://iec.ch/TC57/2013/CIM-schema-cim16#String">
    <xs:simpleContent>
      <xs:extension base="PartyID_String-base">
        <xs:attribute name="codingScheme" type="cl:CodingSchemeTypeList" use="required"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xsd:simpleType name="CodingSchemeTypeList">
    <xsd:union memberTypes="cl:StandardCodingSchemeTypeList cl:LocalCodingSchemeType"/>
  </xsd:simpleType>

  <xsd:simpleType name="StandardCodingSchemeTypeList">
    <xsd:annotation>
      <xsd:documentation>
        <Uid>ET0004</Uid>
        <Definition>Codification scheme used to identify the coding scheme used for the set of coded values to identify specific objects.</Definition>
      </xsd:documentation>
    </xsd:annotation>
    <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="A01">
        <xsd:annotation>
          <xsd:documentation>
            <CodeDescription>
              <Title>IC</Title>
              <Definition>The coding scheme is an Identification Coding Scheme</Definition>
            </CodeDescription>
          </xsd:documentation>
        </xsd:annotation>
      </xsd:enumeration>
      ...
      <xsd:enumeration value="A10">
        <xsd:annotation>
          <xsd:documentation>
            <CodeDescription>
              <Title>LOCNR</Title>
              <Definition>The coding scheme for the preceding attribute is a location number.</Definition>
            </CodeDescription>
          </xsd:documentation>
        </xsd:annotation>
      </xsd:enumeration>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:simpleType name="LocalCodingSchemeType">
    <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="A01"/>
    </xsd:restriction>
  </xsd:simpleType>

I tried client.get_type('ns5:PartyID_String') but that gave the same error. I also tried to prefix the string ‘A10’ with extra type information but that didn’t seem to have any effect.