The IXMLValidator/XMLValidator interface/class provides methods to (i) validate various types of documents, (ii) check documents for well-formedness, and (iii) extract an Avro schema from an Avro binary. You can also provide additional processing via a Python script.
Note that the name of the interface in the COM/.NET API is different than that of the class in the Java API:
•In COM/.NET: IXMLValidator
•In Java: XMLValidator