Dear Mr. Busfield,
As you may already know SLX is a compressed package that conforms to the Open Packaging Conventions (OPC) interoperability standard. SLX stores model information using Unicode® UTF-8 in XML and other international formats. Therefore in Simulink it is easy to export an slx file to an xml file.
What you may can try is to write the following in the MATLAB prompt:
>> save_system('model.mdl', 'model_xml.xml','ExportToXML', true);
A second possibility is that you save the mdl file in Simulink (2014 Version) to a slx file. In principle, if you upgrade an MDL file to SLX file format, the file contains the same information as the MDL file, and you always have a backup file. Now you could compare the xml files.
Kind regards, Christiaan
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