A fieldset, as in HTML is just a set of Fields. A fieldset must have a unique name, and every content type can have infinite fieldsets. Each fieldset will be a section made by one or more fields (you will likely see many <field> nodes and fews fieldsets).
Use fieldsets to organize semantically the fields on the administration.
A fieldset can also include a 16x16 px icon, using the “icon” attribute. The available icons are included under themes/admin/widgets/schemes_icons. Feel free to add many other icons as you need.
This will be a tipical structure of a fieldset node:
fieldsets : - name : General informations icon : page fields : my_field : ... other_field : ... third_field : ...
or, if you’re using XML schemes:
<fieldset name="General informations" icon="page"> <field></field> <field></field> <field></field> ... </fieldset>
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