During some tests with Collada plugin - because of some issues related to the normals exported - it was noticed some inconsistences in the file generated. I used the smllint parser with Collada 1.4.1 schema (on-line | http://collada.org/mediakiki/index.php/Schema_validation):
- the "library_image" session has been exported with no images/texture in the scene and generating an inconsistent id (ID="-img") for the "image" session;
- for the material ("phong"), the diffuse attribute has been written in the wrong order.
- the parser has pointed that the "node"'s id was not unique. It was noticed that it was the same used for its "geometry"'s id.

In order to applay the fixes it was used the "COLLADA Digital Asset Schema Release 1.4.1 Specification (2nd Edition)" and parsed on-line, as well the ".dae" file was read using a 3rd software.