Add the INTERLIS 2.3 modell files in this folder.
You need to have the necessary model files in this subfolder ili:
For Schema VSA_DSS_2015_2:
Units.ili
Base.ili
SIA405_Base.ili
VSA_DSS_2015_2_d.ili
For schema SIA405_Abwasser_2015_2:
units.ili
base.ili
sia405_base.ili
SIA405_Abwasser_2015_2_d.ili
License for use needed from VSA or sia: You can get it by purchasing Norm SIA405 2016 (http://www.webnorm.ch/null/null/sia%202016/d/2012/D/Product) or VSA-DSS CD (https://dss.vsa.ch)