whitespace - confirmation please

["Samuel Wright" <lykoszine@gmail.com>]

Hi All,

Could someone give me a hand regarding my understanding of whitespace.
Whitespace is significant in any element that can contain text, as I
understand it.

so
----
<para>sdfsdfsdfds<para>
----

is better than
----
<para>
sadsdsd</para>
----

Does this apply also with subelements?
----
<para><simplelist>...
----
not
----
<para>
<simplelist>...
----

What about editor indentation? Do all my <para> elements need to be at
the start of the line?

ie

----
<para>.asdad.fsdfdfsdfsdf
sadasdsdasdasdasdasdasdsadsdasd
----
or is
----
__<para>asdsfgfra sdfdfsdfdfgfg
__asdfdfdfgfhfg fgjhgj ghjhgjh
----
Ok? (I have used double underscore "__" to represent 2 spaces)

Thanks again for your time
S