The Template file is a combination of HTML code and Groovy code blocks. In eXo IDE, you can create and edit those files in editor.
1. Click 
on the toolbar and then select Template from the drop-down menu; or select File --> New --> Template from the top menu. A new file is opened in the editor.
2. Add content.
3. Save the file by selecting File --> Save As from the top menu, or by clicking 
on the toolbar.
Both Outline pane and Auto-complete form can be used to edit the Groovy Template.
To view properties of the template, click 
on the right corner of the toolbar.
