manifest.xml file in the META-INF folder [Minor]

[kdoul]

ph-asic adds this in the ASiCs it produces but this is not included in the ETSI standard.
This could cause some issues with other libraries. For example, the DSS library shows a warning that this file is not supported:
Unsupported files : [Name: META-INF/manifest.xml / text/xml / null]

[phax]

This seems to be from

OASIS OpenDocument v1.0
  OASIS standard, 1 May 2005
  Relax-NG Manifest Schema

[phax]

With the new API AsicWriterFactory.newContainer you have the possibility to add a parameter to disable creation of the OASIS manifest. That should do the trick.