The current PyWrapper TAPIR implementation does not support the entire XML Schema language.

Not yet supported schema constructs are:

• recursive structures in global types or elements
• substitution groups
• key/ref mechanisms

Also the current implementations require all concepts (elements or attributes) that should end up containing values in the instance document to have a data type specified in the schema - at least a xsd:string type.

You can test a schema with the plain SchemaParsingRequest.