spaces in wms_layer_group

[Jeff de La Beaujardiere]

It appears that wms_layer_group metadata does not allow spaces except in 
the last item of the sequence. For example (in mapserv 4.4.2):

Legal:
/Aqua MODIS 1km imagery
/2005/2005-16/Aqua MODIS 1km imagery
/Aqua_MODIS_1km_imagery/2005/2005-06

Forbidden:
/Aqua MODIS 1km imagery/2005/2005-06

Is this a bug or a feature? In WMS, Titles of un-Named Layers are 
permitted to contain spaces.

-Jeff DLB