See: CategoryPatternForm

a PatternForm is a format and structure used to write a pattern. Some well known forms are:

	* AlexandrianForm
	* CanonicalForm
	* CoplienForm
	* GoFform
	* CompactForm
	* CockburnPmForm
	* PortlandForm (also known as ThereforeBut)
	* BeckForm
	* FowlerForm
	* CoreJ2EEForm