Post HTML comment with REST API

Hi, 

I'm trying to post "rich text" in the field "comment" of a test_set with the REST API of QC.

For example, post a CR.

I have tried "\n", it's not working. 

I have tried <br/>, it's not working.

Is it possible ?

My XML posted : 

<Entity Type="test-set"><Fields><Field Name="comment"><Value>lorem ipsum<br/>lorem ipsum</Value></Field></Fields></Entity>

Thanks for your help.

BR,

Eric