The conditional expression will be executed against the target type of the style if must return a boolean. If it returns ...

                              The conditional expression will be executed against the target type of the style if must return a boolean.
                              If it returns true then the setters will apply to the matching graph objects.
                              The expression can access properties on the graph objects and static methods of the .NET Math, String and Color classes.
                              For example, the expression 'LinesOfCode > 10' will match all nodes that have a LinesOfCode property with a value greater than 10.