XLIFF and ditamap

Hello,

I start to make some structured document.

this is my structure : A map contains topicset with topics:

The problem is with the Xlif file.

It contains only one file, all my topcis have disappeared.

The xlif file created contains the tags topicref of all the topics but that's all.

Can you tell me if my structure is not correct. What kind of structur shoud i use ? Topic group ? 

Thanks for your help