Presented herein are declarative virtual data model management techniques, sometimes referred to herein more simply as declarative management techniques, for creating, controlling, and managing the lifecycles of virtual enterprise data models. The working machine also includes a control unit for controlling rotation of the motors. A second compression portion of the image other than the group of pixels is also determined. The collet chuck defines a collet receiving passage configured to slidably receive the collet. The gap is sensitive to out-of-focus conditions during lithographic processing, where the gap increases as defocus increases.