Can I use the PMML Converter to convert any old PMML file to version 4.0?

You can use the PMML Converter to validate your PMML file against the specification for versions 2.1, 3.0, 3.1, 3.2 and 4.0. If validation is not successful, the converter will give you a file back with explanations for why the validation failed (click on the "details" hyper-link).

So, before actual conversion takes place, the validation phase needs to be successful, i.e. your file needs to conform to the PMML specification as published in the DMG website (for any of the older PMML versions listed above). For known PMML issues (from a variety of sources/vendors), the PMML Converter will actually correct your file so that the model can be converted.

The PMML converter will convert the following model elements to PMML 4.0:

• Neural Networks
• Decision Trees
• Support Vector Machines
• General Regression
• Regression
• Clustering Models (including Two-Step Clustering from SPSS)
  
• Association Rules
• Ruleset Models
• Naive Bayes Classifiers
  

It will also convert pre- and post-processing PMML elements.