InteriorPoint elem = new InteriorPoint();
domain.addInteriorPoint(elem);
return elem;
} else if (elementName.equals(SpatialConstants.analyticVolume)) {
AnalyticGeometry av = (AnalyticGeometry) listOf.getParentSBMLObject();
AnalyticVolume elem = new AnalyticVolume();
av.addAnalyticVolume(elem);
return elem;
} else if (elementName.equals(SpatialConstants.sampledVolume)) {
SampledFieldGeometry sfg = (SampledFieldGeometry) listOf.getParentSBMLObject();
SampledVolume elem = new SampledVolume();