Struts2-bootstrap-plugin

I was looking at apache roller which uses the struts2-bootstrap-plugin.

When I check the generated id's they seem to have extra underscores?

<input type="submit" value="Post to Weblog" 
id="entry____mainAction__publish" name="action:entryEdit!publish" 
class="btn btn-success">

Is this intentional?

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When I look at "normal" tags only see one underscore:

<input type="submit" value="Create" id="myAdd_myAdd_save" 
name="action:myAdd!save">