translator.validateV4Basics( v4Model, v3Model.getGroupId(), v3Model.getArtifactId(),
v3Model.getVersion(), v3Model.getPackage() );
writer = new StringWriter();
MavenXpp3Writer xpp3Writer = new MavenXpp3Writer();
xpp3Writer.write( writer, v4Model );
transaction.createFile( writer.toString(), targetFile, digesters );
List<String> warnings = translator.getWarnings();