...viewpoint.

Physically, the tree is stored as a rotated binary tree, although other underlying representations would also be possible.

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...``consistent''

See [9] for details. Each group may have several places where a break is possible. An inconsistent break will select one of those possible places to break the line, whereas a consistent break will select all of these places if a break is needed anywhere in the group. This allows the following formatting to be realized (assuming breaks are possible before +):

Inconsistent

( x = a + b + c
		 + d + e + f)    

Consistent

( x = a
		 + b
		 + c
		 + d
		 + e
		 + f)      

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