* <big>[[Modeling Guide for 3D Objects - Part 1: Basics (Rules for Validating GML Geometries in CityGML)|Modeling Guide for 3D Objects - Part 1: Basics (Rules for Validating GML Geometries in CityGML)]] ( Version 0.7.0 EN, English) [[File:Adobe_PDF_Icon.svg|20px|link=http://files.sig3d.org/file/ag-qualitaet/201311_Modeling_Guide_for_3D_Objects_-_Part_1.pdf]]</big> | * <big>[[Modeling Guide for 3D Objects - Part 1: Basics (Rules for Validating GML Geometries in CityGML)|Modeling Guide for 3D Objects - Part 1: Basics (Rules for Validating GML Geometries in CityGML)]] ( Version 0.7.0 EN, English) [[File:Adobe_PDF_Icon.svg|20px|link=http://files.sig3d.org/file/ag-qualitaet/201311_Modeling_Guide_for_3D_Objects_-_Part_1.pdf]]</big> |