[Python] how to use xsd with included and imported files with python

I have a base.xsd file which includes an enums.xsd. Both files are in the same directory.

<xs:include id="enums" schemaLocation="enums.xsd"/>


The enums.xsd imports:

<xs:import
namespace="http://www.wipo.int/standards/XMLSchema/Common/0"
schemaLocation="ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedWIPOST3CodeType-V0-3.xsd"/>

<xs:import
namespace="http://www.wipo.int/standards/XMLSchema/Common/0"
schemaLocation="ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedISOLanguageCodeType-V0-4.xsd"/>

<xs:import
namespace="http://www.wipo.int/standards/XMLSchema/Common/0"
schemaLocation="ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedISOCurrencyCodeType-V0-1.xsd"/>


These files include some other xsd files.

After all this base.xsd defines

<xs:simpleType name="tCountryCodes">
<xs:union memberTypes="com:ExtendedWIPOST3CodeType" />
</xs:simpleType>

<xs:simpleType name="tLangs">
<xs:union memberTypes="com:ExtendedISOLanguageCodeType" />
</xs:simpleType>

<xs:simpleType name="tCurrencyCodes">
<xs:union memberTypes="com:ExtendedISOCurrencyCodeType" />
</xs:simpleType>


when I use the following python code: schema = xmlschema.XMLSchema(xsd_path) I get the following error:

Error: unknown type '{http://www.wipo.int/standards/XMLSchema/Common/0}ExtendedISOLanguageCodeType'
​

which is defined in ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedISOLanguageCodeType-V0-4.xsd as:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:com="http://www.wipo.int/standards/XMLSchema/Common/0"
targetNamespace="http://www.wipo.int/standards/XMLSchema/Common/0"
elementFormDefault="qualified"
attributeFormDefault="qualified" version="0.4">
<xsd:include schemaLocation="ISOLanguageCodeType-V0-1.xsd"/>
<xsd:include schemaLocation="ISOFormerLanguageCodeType-V0-1.xsd"/>
<xsd:simpleType name="ExtendedISOLanguageCodeType">
<xsd:union memberTypes="com:ISOLanguageCodeType com:ISOFormerLanguageCodeType"/>
</xsd:simpleType>
</xsd:schema>


As you can notice there is no issue with com:ExtendedWIPOST3CodeType whose definition precedes com:ExtendedISOLanguageCodeType

The xs:schema of base.xsd comprises xmlns:com="http://www.wipo.int/standards/XMLSchema/Common/0". I check all the xmlns and targetNamespace.

If I change base.xsd to:

<xs:import
namespace="http://www.wipo.int/standards/XMLSchema/Common/0"
schemaLocation="ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedWIPOST3CodeType-V0-3.xsd"/>

<xs:import
namespace="http://www.wipo.int/standards/XMLSchema/Common/0"
schemaLocation="ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedISOLanguageCodeType-V0-4.xsd"/>

<xs:import
namespace="http://www.wipo.int/standards/XMLSchema/Common/0"
schemaLocation="ST96AnnexIIISchemas-V0-11/Common/0/Basic/ExtendedISOCurrencyCodeType-V0-1.xsd"/>

<xs:simpleType name="tCountryCodes">
<xs:union memberTypes="com:ExtendedWIPOST3CodeType"/>
</xs:simpleType>

<xs:simpleType name="tLangs">
<!--
<xs:union memberTypes="com:ExtendedISOLanguageCodeType"/>
-->
<xs:restriction base="xs:string"/>
</xs:simpleType>

<xs:simpleType name="tCurrencyCodes">
<!--
<xs:union memberTypes="com:ExtendedISOCurrencyCodeType"/>
-->
<xs:restriction base="xs:string"/>
</xs:simpleType>


The xsd is well loaded and used.

The exact same xsd is accepted by dotnet 8 code.

What can I do from here to avoid the error ?

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