1) Use of substitution groups to define descendents of gluon and interval to represent Price/Product and other components
1. Use Substitution Groups for powerProductDescription (substitution group =emix:gluon) and powerProductData (substitution group =emix:interval)
2. Examples are provided in the revised (in associated zip file at the end of the White Paper) Power.xsd, Resource.xsd and are also applicable to transport.xsd.
3. In the revised EMIX Schema the emix:sequence contains the Power Products (which I never could find before this change).