Collaboration diagram for Modules involved in tree building:

Modules
	Question sets for decision-tree clustering
	See Decision tree internals (and specifically Questions (config class)) for context.

	Low-level functions for manipulating statistics and event-maps
	See Decision tree internals and specifically Classes and functions involved in tree-building for context.

	Intermediate-level functions used in building the tree
	These functions are are used in top-level tree-building code (Top-level tree-building functions); see Decision tree internals for documentation.

	Top-level tree-building functions
	See Decision tree internals for context.

	Event maps
	See Decision tree internals for overview, and specifically Event maps.

Classes
class	ContextDependencyInterface
	context-dep-itf.h provides a link between the tree-building code in ../tree/, and the FST code in ../fstext/ (particularly, ../fstext/context-dep.h). More...

Typedefs
typedef std::vector< std::pair< EventType, Clusterable * > >	BuildTreeStatsType

Enumerations
enum	AllKeysType { kAllKeysInsistIdentical, kAllKeysIntersection, kAllKeysUnion }
	Typedef used when we get "all keys" from a set of stats– used in specifying which kinds of questions to ask. More...