`THTMLEntityProducer`
pl	ro	Entity

`THTMLCustomEntityProducer`
pt		Entity

`THTMLContentProducer`
pt	ro	ContentProducerList
		ParentElement
		Writer
		HTMLDocument
		IDSuffix
	ro	Identification
	ro	Childs
	ro	AcceptChildsAtDesignTime
		parent

`THTTPContentProducer`
pt		BeforeRequest
pt		AfterResponse
	ro	Request
	ro	Response