D.1.1 Main changes in Modelica 3.5
The following Modelica Change Proposals are backward compatible extensions added in 3.5:

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Change of specification format (MCP0018). The development of the specification was changed to use LaTeX for formatting; and https://github.com/modelica/ModelicaSpecification for issuetracking.

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Annotations for Predefined Plots (MCP0033), section 18.2.2. Ticket #2710.

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Generalize links in text markup, section 18.2.2.3. Ticket #2692.

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Mandate that Axis.unit is for tick labels, section 18.2.2.1. Ticket #2633.

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Define meaning of empty Axis.unit, section 18.2.2.1. Ticket #2632.

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Elaborate on inheritance of figures, section 18.2.2. Ticket #2588.

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Clarified that leading and ending newline is ignored, section 18.2.2.5. Ticket #2581.

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Made figure title optional, section 18.2.2. Ticket #2580.

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Clarified curves and units for figures, section 18.2.2.1 and section 18.2.2.2. Ticket #2579.

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Clarified uniqueness of Figure and Plot identifiers, section 18.2.2. Ticket #2544.

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Relaxed uniqueness of Plot identifiers, section 18.2.2. Ticket #2537.

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Updated to have HTMLcaption, subplot title and identifier. Ticket #2363.

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Other issues resolved were:

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Overall improvements of the document, made easier by the switch to LaTeX.

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A real bibliography was added, but excluding papers in this chapter; #2740.

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Dead links in the bibliography were removed and DOI used when possible. Ticket #2502.

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Chapter introductions are now nonnormative, #2366.

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The index was updated to reference the main definition of the term, and the glossary removed to avoid duplicated effort; #2726.

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Hyphens and dashes were cleaned up, #2628.
 –

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Moved nonnormative text to separate paragraphs. Ticket #2536.

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Consistent use of different quote symbols. Ticket #2508.

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The minor issues related to change of formatting, continuous integration, examples, and maintenance of repository are not listed here.

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Improved functions, chapter 12.

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Clarified impure function as function arguments, section 12.3. Ticket #2756.

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Clarified that public variables in functions must be input or output, section 12.2. Ticket #2730.

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Changed inputs to C functions to be constcorrect, section 12.9.1.2. Ticket #1955.

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Clarified that external object is a class, section 12.9.7. Ticket #2705.

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Deprecate "builtin" external language, section 12.9. Avoid reference to Modelica.Math section 3.7.3. Ticket #2662.

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Clarified functions with no outputs, section 12.4.7. Ticket #2692.

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Replace use of outdated grammarconstruct classname, section 13.5, section 12.4.2, and section 18.7. Ticket #2598.

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Updated example for function as argument to function, section 12.4.2. Ticket #2563.

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Extend function inverses and clarify them, annotation 12.3. Ticket #2478.

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Clarify consequence of using impure functions in binding equations for parameters, section 12.3. Ticket #2475.

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Removed deprecated assignments from function declaration template, section 12.1. Ticket #2439.

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Corrected regression in example specifying the second derivative of a function, section 12.7.1. Ticket #2401.

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Clarified variability restrictions of inputs in functions, section 3.8.2. Ticket #2243.

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Clarified handling of lib/dll on Windows, section 12.9.4. Ticket #2252.

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Clarified function component, section 12.4.2. Ticket #2255.

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Clarified that objectfiles are not libraryfiles, section 12.9.4. Ticket #2257.

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Clarified ModelicaAllocateString, section 12.9.6. Ticket #2279.

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Clarified memory management for external objects, section 12.9.7. Ticket #2524.

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Introduced ModelicaDuplicateString for Ccode, section 12.9.6.2. Ticket #2417.

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Improved ModelicaAllocateString for Ccode, section 12.9.6.2. Ticket #2403.

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Clarified synchronous Modelica, chapter 16

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Clarified that clock operators are not callable in functions and that functions may not contain Clockvariables and that they do not vectorize, section 16.2.3. Ticket #2177 and Ticket #2269.

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Clarified that clocks are not valid inputs for hold, section 16.5.1. Ticket #2174.

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Clarified rational clock to only have translationtime clock inference, operator 16.2. Ticket #2386.

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Clarified that different clock partitions should be separate, section 16.7.4. Ticket #2365.

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Rewrote rationale to be positive, section 16.1. Ticket #2512.

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Clarified terminology for discrete states, section 16.4. Ticket #2651.

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Clarified that clocked signals are extrapolated using hold, not constant section 16.2.1. Ticket #2607.

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Clarified that clock constructors can take named arguments and that clock partioning must be parametric, section 16.3; Ticket #2394.

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Restricted noClock to not take a Clock as input, section 16.5.2. Ticket #2355.

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Consistently use "Event Clock". Ticket #2356.

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Clarified that Boolean clock is considered for clock partitioning, section 16.7.3. Ticket #2179.

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Clarified Real Clock constructor interval argument, section 16.3. Ticket #2180.

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Clarified inferencing of solverMethod by rewriting algorithm, section 16.8.4. Ticket #2182.

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Clarified wording of solver method for clock constructor, section 16.3. Ticket #2194.

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Clarify that clocked operators cannot be differentiated, section 16.5.2. Ticket #2236.

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Clarified that hold and backSample only take component expressions, section 16.7.1. Ticket #2270.

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Clarified statemachines, chapter 17.

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Removed color recommendation for state machines, section 17.2. Ticket #2650.

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Clarified connecting multiple outputs (for statemachines), section 17.3.6. Ticket #2735.

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Clarified inactive equations, section 17.3.3. Ticket #2734.

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Defined hierarchical ticksInState and timeInState, section 17.1. Ticket #2407.

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Correct both variants of nextResetStates to clarify reset handling, section 17.3.2. Ticket #2209.

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Conversions, section 18.8.2.1, were used for Modelica Standard Library 4.0.0, and were thus clarified and slightly extended for the future.

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Extend convertMessage to elements of classes, section 18.8.2.1. Ticket #2516.

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Clarify convertClassIf for enumerations and strings and restrict allowed types, section 18.8.2.1. Ticket #2451.

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Further clarify conversion rules, section 18.8.2.1. Ticket #2522.

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Avoid ambiguity by giving precedence to convertModifiers, section 18.8.2.1. Ticket #2409.

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Clarified inheritance for conversions, section 18.8.2.1. Ticket #2178.

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Added and clarified other specific annotations, chapter 18.

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Annotation SourceDirectory which is a starting point for exporting sources, section 12.9.4. Ticket #2145.

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Clarified Evaluate annotation for hierarchical components, section 18.3. Ticket #2288.

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Added testcase annotation for incorrect models, annotation 18.4. Ticket #2340.

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Clarified choicesAllMatching, section 7.3.4. Ticket #2693.

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Clarified HTML encoded contents, section 18.2. Ticket #2593.

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Allow restricted form of Dialog annotation for classes, section 18.7. Ticket #2617.

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Clarified connectorSizing, section 18.7. Ticket #2599.

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Improved description for Documentation annotation (included with MCP0033), section 18.2. Ticket #2594.

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Clarified order in parameter dialog, section 18.7. Ticket #2310.

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Clarify URI fragments, section 18.2. Ticket #2445.

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Specify that Dialog group does not have a default, section 18.7. Ticket #2476.

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Clarify aspect ratio for lines with arrows, section 18.6.5.1. Ticket #2528.

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Clarify that protection of classes prevent "copying", section 18.9.1. Ticket #2260.

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Extended bitmaps to allow svgformat, section 18.6.5.6. Ticket #174.

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Clarified macros for text, section 18.6.5.5. Ticket #2416.

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State that changing default name for inner/outer component is not good, section 18.7. Ticket #2398.

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Clarified that preserveAspectRatio is a hint, section 18.6.1.1. Ticket #2268.

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Clarified that includefiles provide prototypes, section 12.9. Ticket #2278.

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Clarified visibility of encrypted contents, section 18.9.1. Ticket #2318.

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Clarified that missingInnerMessage is a literal string, section 18.7. Ticket #2334.

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Clarified textmacros including %class, section 18.7. Ticket #2335.

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Clarified that obsolete is not inherited, section 18.7. Ticket #2338.

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Added unit for %par, section 18.7. Ticket #2339.

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Clarified textannotations on connections, section 18.6.4. Ticket #2170.

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Add iconVisible to be able to show/hide connectors in icon layer for public connectors, section 18.6.2. Ticket #2200.

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Correct grammar for experiment and give default for StartTime, annotation 18.2. Ticket #2224.

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Clarified that versionBuild and dateModified can be used for uses annotation, section 18.8.2. Ticket #2239.

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Clarified that image backgrounds are assumed to be white/transparent with light color, section 18.7. Ticket #2244.

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Clarified that IconMap is also allowed on short class definitions, section 18.6.3. Ticket #2281.

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Clarify that some protection annotations have no effect (not merely no "meaningful effect"), section 18.9.1. Ticket #2193.

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Minor updates of syntax, appendix A.

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Update grammar to use description instead of nonexistent comment, section A.2. Ticket #2620.

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Allow empty quoted identifier, section 2.3.1. Ticket #2612.

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Allow .13 as floating point number, section 2.4.1. Ticket #2122.

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Factor out functionpartial application, section A.2.7. Ticket #2250.

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Reverted regression for function arguments, section A.2.7. Ticket #2176.

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Renamed stringcomment to descriptionstring, section 2.2. Ticket #2467.

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Clarified quoted identifiers, section 2.3.1. Ticket #2408.

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Correct grammar to allow ".*" as one token for import, section A.2.2. Ticket #2430.

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Removed redundant parentheses in syntax rules, section A.2. Ticket #2434.

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Removed old underscores in syntax rule, section A.2.7. Ticket #2431.

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Corrected use of annotationcomment, section A.2.3. Ticket #2428.

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Improved DAEchapter to be a complete description, appendix B.

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Improved stream connector formulation, appendix C

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Updated notation to use massflows as derivatives, appendix C. Ticket #2644.

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Further clarify inStream simplifications, section C.3.3. Ticket #2242.

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Clarified inStream to make it clear that positive massflow is assumed, section C.2. Ticket #2253.

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Stated that disable conditional components are ignored for inner/outer, section 5.4. Ticket #2499.

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Clarify some use of heterogenous record arrays, chapter 10. Ticket #2282.

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Allow end for noninteger indexed arrays, section 10.5.2. Ticket #2204.

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Improved encapsulated short class to be consistent with encapsulation, section 4.5.1. Ticket #2743.

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Clarified that array declarations cannot be scalar, section 10.1. Ticket #2753.

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Clarified acyclic rule for nonfixed parameters, section 4.4.3. Ticket #2742.

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Clarified final for classes, section 7.2.6. Ticket #2676.

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Made whendescriptions more similar, section 8.3.5.2 and section 8.3.5.3. Ticket #2635.

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Make assertion level a structural parameter, section 8.3.7. Ticket #2642.

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Deprecate byte order mark, section 13.4.1. Ticket #2675.

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State that matrix/vector algebra functions return Real, section 10.3.5. Ticket #2673.

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Clarified each, section 7.2.5. Ticket #2630.

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Clarified elsewhen initial, section 8.6. Ticket #2636.

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Consistently use "discretetime variable". Ticket #2640.

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Clarified use of expandable connector, section 9.1.3. Ticket #2606.

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Made ndims constant, section 3.8.1. Ticket #2605.

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Restrict use of size of components of expandable connectors, section 9.1.3. Ticket #2560.

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Clarify scoping for component names, section 5.3.2. Ticket #2547.

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Extend promote to be allowed in Modelica, and not only internally in the specification, section 10.3. Ticket #2568.

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Clarify that iterator ranges cannot be deduced from expandable connector variables, section 11.2.2.1. Ticket #2560.

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Restructure description of Real and Integer types to keep details together, section 4.8.1. Ticket #2552.

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Clarify pre for arrays, section 3.7.5. Ticket #2566.

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Clarify variability guarantee, section 4.4.4. Ticket #2553.

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Corrected errors in example of overdetermined connectors for power system, section 9.4.3.1. Ticket #2564.

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Cleanup of example of overdetermined connectors for power system, section 9.4.3.1. Ticket #2565.

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Correct so that normal connector cannot inherit from expandable connector, section 7.1.3. Ticket #2298.

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Clarify that locally nonsingular models can be combined to a globally singular model, section 4.7. Ticket #2510.

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Clarify interaction between variability and perfect matching, section 3.8. Ticket #2525.

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In examples change SIunits to Units.SI following MSL 4.0.0. Ticket #2504.

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Remove outdated statement that model and class are the same, section 4.6. Ticket #1345.

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Remove outdated statement that constants cannot be modified, section 12.6. Ticket #2492.

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Revert regressions for lookup, section 5.3. Ticket #2175.

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Clarify handling of equations involving connectors, section 4.6. Ticket #2235.

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Clarified some builtin array functions, section 10.3.5. Ticket #2295.

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Clarified when initial() for algorithms, section 8.6. Ticket #2436.

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Clarify differentiability of expressions, section 4.4.4. Ticket #2464.

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Clarified standard type coercion, section 10.6.13. Ticket #2326.

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Fully renamed declaration assignments to binding equations, section 12.4.4. Ticket #2249.

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Restrict lefthand sides to not be components of models and blocks, section 11.2.1.2. Ticket #2385.

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Correct order in example of shortcircuit logic, section 3.3.1. Ticket #2442.

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Clarified evaluation of forequations, section 8.3.2.1. Ticket #2205.

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Clarify how sizes can be deduced from binding equations, section 10.1. Ticket #2212.

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Clarify that component declarations allow indexing with types, section 4.4.1. Ticket #2221.

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Corrected formulation of synchronous dataflow principle, section 8.4. Ticket #2348.

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Restrict functions to not have connectors  later clarified, section 12.2. Ticket #2308.

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Clarified sample, section 3.7.5. Ticket #2118.

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Clarified that presentation of units is not restricted to ASCII, section 19.1. Ticket #2142.

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Clarified array variants for short classes, section 4.4.2. Ticket #2159.

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Clarified examples for external libraries, section 12.9.4. Ticket #2192.

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Clarified overdetermined connector handling by renaming "breakable branch" to "optional spanning tree edge", section 9.4.1. Ticket #2201.

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Improved pseudocode spatialDistribution, section 3.7.4.2. Ticket #2202.

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Clarified reinit, section 3.7.5. Ticket #2203.

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Allow sum and product of matrix with non integer index, section 10.3.4. Ticket #2204.

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Correct spelling of units to be consistent with SI, chapter 19. Ticket #2232.

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Clarify that description string of modifier replaces existing one, section 7.2. Ticket #2237.

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Clarified that first argument to cat is an integer parameter expression, section 10.4.2. Ticket #2273.

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Clarified illegal modification of outer element, section 5.4. Ticket #2283.