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A change made using the Source model may imply a change in the physical model; changing identifier's representation may result in semantic change if the symbol referenced changes. Properties and elements, whose changes may imply semantic change should be identified. Symbol name resolver should be used to infer symbol referencies from the new symbol appearances. Note that the source model probably will need to access a proper project context somehow.
This issue was indirectly solved by redesign of Source and Physical metamodels. With new design, no synchronization is needed.