Compare any two baselines of the current module on Doors with filtering the changes. Or compare baselines with external tool. All attributes of both modules or only selected ones can be compared. The attributes to compare can be selected according to regular expressions. Unchanged attributes or all main attributes can be included in the output to get a better picture of the context, in which a change has been made. I seem to have misunderstood something really basic with the DXL language. Below I have provided the script and the error message i receive, I will also try to explain my intentions with the script The intention of this article was to familiarize you with DOORS DXL and show you different data types that are supported by DXL scripting. Please comment below if you have any questions/suggestions. Regarding your question, I think that breaking of DxlObject in the post you mentioned is a one time thing (caused by ambiguous declaration of DxlObject operators) and should not happen with the other operators. IBM Rational DOORS DXL Reference Manual Release 9.5. Before using this information, be sure to read the general information under the Notices chapter on page 919. When you run the module comparison wizard, you can show differences in a column in the newer module. Switch off the filter to see the changes with markup. DXL (DOORS eXtension Language) is a scripting language specially developed for Rational DOORS. DXL is used in many parts of Rational DOORS to provide key features, such as file format importers and exporters, impact and traceability analysis and inter-module linking tools. DXL (DOORS eXtension Language) is a scripting language specially developed for Rational DOORS. DXL is used in many parts of Rational DOORS to provide key features, such as file format importers and exporters, impact and traceability analysis and inter-module linking tools. Operators specify the type of calculation that you want to perform on elements in a formula—such as addition, subtraction, multiplication, or division. There are four different types of calculation operators: arithmetic, comparison, text concatenation, and reference.