`TBufDatasetParser`
pt		FillExpressList
pt		HandleUnknownVariable
pt		GetVariableInfo
pt		CurrentExpression
pt		GetResultType
pt		SetCaseInsensitive
pt		SetPartialMatch
		Create
		Destroy
		ClearExpressions
		ParseExpression
		ExtractFromBuffer

`TCustomExpressionParser`
pt		MakeRec
pt		FillExpressList
pt		HandleUnknownVariable
pt		CompileExpression
pt		EvaluateCurrent
pt		DisposeList
pt		DisposeTree
pt		CurrentExpression
pt		GetResultType
		Create
		Destroy
		DefineFloatVariable
		DefineIntegerVariable
		DefineLargeIntVariable
		DefineDateTimeVariable
		DefineBooleanVariable
		DefineStringVariable
		DefineFunction
		Evaluate
		AddExpression
		ClearExpressions
		GetFunctionNames
		GetFunctionDescription