The main difference of IndoorGML 1.1 from the previous one (v.1.0.3) is the inclusion of "level" property of CellSpace. Since "level" property is an optional and cardinatity is [0..*], no conflict takes place with IndoorGML 1.0.3. The remaining part is exactly identical with the previous InFactory (https://github.com/STEMLab/InFactory)