[Tex/LaTex] Newline, indentation, parskip – when to use what in what stylistic manner

Question

I intend to use scrbook. In real-life literature, English and German language, the text often looks like this:

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
    At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.
    At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.

Especially in longer chapters there's often somewhere an empty line followed by a non-indented text. While the regular text often has new lines with indented text.

A popular example: The Ultimate Hitchhiker's Guide to the Galaxy on Amazon.com, scroll through it and you will see real-life text that is like this (Page 8 and 9 for example).
Another example are the UK Discworld books by Terry Pratchett.

My questions:

• Which of the two is a paragraph? The empty line or the indented new line?
• What's the name of the other respectively?
• What's the best way to achieve this in LaTeX?
  1. Redefine \newline to be indented and use parskip=half?
  2. Don't parskip and insert vspaces for the empty line?
  3. Another possibility?
• Is this good style at all?
• Any other hints or information I did not think about?

Answer 1

As mentioned in comments I think that usually in such circumstances the unindented paragraphs are logically section breaks with anonymous untitled sections. So like a titled section they suppress following indentation.

Spacing and font choice could be better and with acknowledgement to Douglas Adams, the except shown in the amazon fragment is I think logically something like this:

\documentclass{book}
\setcounter{secnumdepth}{0}

\begin{document}
\chapter{}

The house stood on a slight rise \ldots

The only person for whom the house was in any way special was Arthur Dent, and \ldots

\ldots bulldozer, found his slippers and stomped off to wash.

\vdots

Fifteen seconds later he was out of the house and lying in front of a big yellow bulldozer that was advancing up his garden path.

\section{}

Mr L. Prosser was, as they say, only human \ldots

He was by no means a great warrior \ldots
\end{document}

Which without any changes to the book layout produces this: