Can iconset xml internal name have spaces

Can the internal name of the iconset have spaces and be named the same as the display name ?
<iconset name="sample">
<display_name>Sample Icon Set</display_name>
Nothing about spaces is mentioned in
Icon Set XML Definition File (gpsoft.com.au)

I’m not sure but I would avoid them in case it causes a problem somewhere. The name isn’t displayed anywhere so how it looks doesn’t matter.