Node elements define individual points along the curve and their physical characteristics. Each node element has the following attributes:

• id - A unique identifier
• x - Horizontal position of the node with respect to the top-left corner of its parent region.
• y - Vertical position of the node with respect to the top-left corner of its parent region.
• layer - Defines z-sorting of the node (optional, rarely used).
• fixed - If "y," then node is fixed in place and not affect by the physics simulation (optional, default is "n").
• mass - The mass of the node, higher numbers enable tighter turns in the curve (optional, default is 1).
• windH - A horizontal force applied only to this node, used to help shape the curve (optional, default is 0).
• windV - A vertical force applied only to this node, used to help shape the curve (optional, default is 0).
• straightLine - If "y", then the line segment following this node is drawn as a straight line instead of as a c-spline (optional, default is "n").

A node element may contain zero or more silhouette elements defining the placement of silhouette images on the timeline. Containment of a particular silhouette by a particular node is more or less arbitrary.

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