Daffodil should ignore attributes in namespaces that it doesn't know anything about. That is a standard and accepted way to add additional information to a schema.

• Daffodil should ignore attributes that it doesn't know about - allows for forwards compatibility
  with new DFDL attributes
  QUESTION: Is it a SDE if DFDL contains ANY attribute that isn't recognized, or just a DFDL property
  in the wrong place?
  > daffodil.bat parse -s AddressDelimited.xsd address.txt
  ...
  Schema Definition Error: Error loading schema(org.xml.sax.SAXParseException; lineNumber: 6; col
  umnNumber: 77; cvc-complex-type.3.2.2: Attribute 'ibmSchExtn:docRoot' is not allowed to appear
  in element 'xsd:element'.) Schema context: SchemaSet. Location in file:SchemaSet