Solid Edge ST8: Live Rules are the maintained geometric relationships within the synchronous modeling environment, were conditions such as parallelism and concentricity are maintained during the editing process. That synchronous functionality is still there, but the big panel type UI has been discarded, in favor of a streamlined Design Intent dialog. The reason for doing so was to aid new adoption of the software.
Each subsequent feature is built on the previous feature. When editing, the model is "rolled back" to the point where the feature was created so that the user cannot try to apply constraints to geometry that does not yet exist.
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