XML schema-derived Enumerator and Pattern have prohibited "fixed" attribute

[sanzoghenzo]

Hi! I'm successfully using this great library to generate code from some BIM related XSD files, namely BCF XML and IDS XML specifications.

I've stumbled upon a problem with the latter: XML files created using the generated classes are invalid, because the xs:enumeration and xs:pattern elements have a fixed="false" attribute that is not allowed.

To generate the classes, I used the command

xsdata generate -p ids.model -ds Google --kw-only --slots ./ids.xsd

At the beginning of the file there are some namespace imports:

<xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://www.w3.org/2001/xml.xsd"/>
<xs:import namespace="http://www.w3.org/2001/XMLSchema" schemaLocation="https://www.w3.org/2001/XMLSchema.xsd"/>
<xs:import namespace="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://www.w3.org/2001/XMLSchema-instance"/>

So xsdata generates the three modules: ids.xml. xmlschema.py and xml.py.

The enumeration element has noFixedFacet type

<xs:element name="enumeration" id="enumeration" type="xs:noFixedFacet">
  <xs:annotation>
    <xs:documentation source="http://www.w3.org/TR/xmlschema-2/#element-enumeration"/>
  </xs:annotation>
</xs:element>

and is translated as

@dataclass(slots=True, kw_only=True)
class Enumeration(NoFixedFacet):
    class Meta:
        name = "enumeration"
        namespace = "http://www.w3.org/2001/XMLSchema"

noFixedFaced is based on facet, but prohibits the use of the fixed attribute defined in the facet:

<xs:complexType name="facet">
  <xs:complexContent>
    <xs:extension base="xs:annotated">
      <xs:attribute name="value" use="required"/>
      <xs:attribute name="fixed" type="xs:boolean" use="optional" default="false"/>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>
<xs:complexType name="noFixedFacet">
  <xs:complexContent>
    <xs:restriction base="xs:facet">
      <xs:sequence>
        <xs:element ref="xs:annotation" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="fixed" use="prohibited"/>
      <xs:anyAttribute namespace="##other" processContents="lax"/>
    </xs:restriction>
  </xs:complexContent>
</xs:complexType>

But this results in an empty NoFixedFacet dataclass that inherits from the Facet class, and it doesn't remove the fixed attibute:

@dataclass(slots=True, kw_only=True)
class Facet(Annotated):
    class Meta:
        name = "facet"

    value: str = field(
        metadata={
            "type": "Attribute",
            "required": True,
        }
    )
    fixed: bool = field(
        default=False,
        metadata={
            "type": "Attribute",
        }
    )


@dataclass(slots=True, kw_only=True)
class NoFixedFacet(Facet):
    class Meta:
        name = "noFixedFacet"

I can fix this by manually editing the NoFixedFaced without inheriting form Facet, but is there a way to tell xsdata to handle the prohibited use of the fixed attribute (so that I don't have to worry about schema updates in the future)?

[tefra]

The fix is on master and I think I am gonna release today!