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I have created diagram using a custom graphical syntax. I would like to be able to change visual properties of certain elements using data key/data value pairs. E.g., I have the key 'optional': with possible values 'T/F'. I would like to set all the elements that are optional:T to be a certain color. Can I do this without AppleScript?

The closest I have found is the Canvas:Selection inspector, but it doesn't allow me to specify the key:value pairing (find all objects with key: optional and value: T).

My second question relates to changing an object's shape. If I select all 'diamond' shapes using the Canvas:Selection inspector, is there a way to change the shape to, e.g., a circle?