`TFieldDef`
	ro	FieldClass
	ro	FieldNo
	ro	CharSize
		InternalCalcField
	ro	ParentDef
		Required
	ro	Codepage
pl		Attributes
pl		DataType
pl		ChildDefs
pl		Precision
pl		Size

`TNamedItem`
		DisplayName
pl		Name

`TCollectionItem`
	ro	UpdateCount
		Collection
	ro	ID
		Index
		DisplayName

`TPersistent`