Methods, Systems and Apparatus for Digital-Marking-Surface Content-Unit Manipulation

Aspects of the present invention are related to systems, methods and apparatus for collecting and displaying digital-marking-surface content based on semantic tags. Some aspects of the present invention relate to ink gestures that invoke content-unit tagging. Some aspects of the present invention relate to ink gestures that invoke the collection and display of like-tagged content units. Some aspects of the present invention relate to ink gestures that invoke the restoration of a viewport or digital sheet to a pre-collection state. Some aspects of the present invention relate to manipulation of content units in a collection view and the persistence of the content-unit manipulations upon restoration of a pre-collect state. Some aspects of the present invention relate to action invocation from a collection view.