Element baseElement = modelElement.getChild("model", Extractor.ns);
ModelExtractor extractor =
(ModelExtractor) ExtractorManager.getExtractor(baseElement
.getName());
Strategy baseStrategy = extractor.extract(baseElement);
MassAbsorptionCoefficient baseMAC =
(MassAbsorptionCoefficient) baseStrategy
.getAlgorithm(MassAbsorptionCoefficient.class);
// Read MAC values
UserSpecifiedCoefficient mac =