Propagation

Although the data objects in the NDF are general, not all applications will know how to process all the objects. For example, the [VARIANCE] in the NDF becomes meaningless after thresholding. Therefore, the rule for propagation, is as follows.

• Applications always propagate extensions.
• An application may only process and propagate a data object whose processing rules it understands and can fully implement, in order to avoid rendering the object meaningless or wrong. Unknown or poorly understood objects must be ignored--never fudged.