code: public void addDecomposes(IfcObjectDefinition parent, IfcObjectDefinition... children) throws IfcModelInterfaceException {
  		IfcRelAggregates ifcRelAggregates = this.create(IfcRelAggregates.class);
  		ifcRelAggregates.setRelatingObject(parent);
  		for (IfcObjectDefinition child: children) {
  			ifcRelAggregates.getRelatedObjects().add(child);
  		}
  	}
docs: Create a decomposes relationship
  
  @param parent The object that represents the nest or aggregation
  @param child The objects being nested or aggregated
  @throws IfcModelInterfaceException