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 warnings = translator.getWarnings();