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in most cases the IHE specificaiton requires that IVL_TS is used as is (i.e it cannot be "collapsed into a TS"). is required the presence of the low attribute.
This is described in th eprescription but not as explicit constrain.
Clarify if when the IVL_TS is declared in ART DECOR this mean that shall be an IVL_TS or could be an IVL_TS or a TS.