Any object/structure can have a string attached as a label. The strings are not shown in the diagram, with the exception of matrix. Matrix labels are used for automatic animation by msts.

• ellipse - end point, built in value
• parallelogram - vector
• box - object
• octagon - optional end point
• trapezium optional vector

MSTS SHAPE

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This object is not to spec, there may be a list of names on a one to one ratio with shape_geom_ref. But that would be unlikely because every object can have its own string for a name. It's possible that there is no shape_named_data_header, but only a shape_named_geometry value. Another possibility is the shape_named_geometry is a vector, but each object in the vector has a name and a separate name value is also unlikely, but this would make the number of names in header redundant but useful. I have not found this object used anywhere, so who could know.