`THTMLDatasetContentProducer`
pl	ro	OnWriteHeader
pl	ro	OnWriteFooter
pl	ro	OnWriteRecord

`THTMLCustomDatasetContentProducer`
		OnWriteHeader
		OnWriteFooter
		OnWriteRecord
pl		OnChangeCS
pl		OnChange

`THTMLContentProducer`

`THTTPContentProducer`