The keyword TEXT_BLOCK is deprecated and might be removed in a future version. If you want to insert a Text Block in your result document use the keyword TEXTBLOCK.
The keyword EDITABLE_TEXTBLOCK replaces the statement QUESTION TEXT_BLOCK that can be used in a FORM question, to indicate that the end user can enter text content with layout. For more information refer to EDITABLE_TEXTBLOCK in the topic that explains the FORM statement.