Catalog documentation confusion

Tristian Celestin <[email protected]> Wed, 5 Mar 2014 02:21:21 +0000
Newsgroups gmane.comp.gnome.glade.user
Message-ID <[email protected]>
I am reading the documentation regarding adding catalogs to Glade (https://developer.gnome.org/gladeui/unstable/catalogintro.html). 

What does it mean to "optionally provide code support"? I understand that a catalog can provide icons so that one can identify new widgets in the palette. I also understand that a library implementing the widget can be provided so that properties and signals can be identified. Is the "code support" referring to this latter feature, or is it something else? 		 	   		  
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