Line breaks for nested elements?

[mrtorrent]

Just curious, in all examples (i.e. in tutorials, books, etc.) I see child/sub-elements on a NEW line from the main element, for example:
<note>
<title>foo</title>
<message>bar</message>
</note>
I've never seen:
<note><title>foo</title>
<message>bar</message></note>

What I'd like to know is: is this a REQUIREMENT of XML, that each element be on its own line, or is this just a style nicety that most people obey?

 

[chiph]

It's not a requirement. XML is perfectly happy with all elements on a single line. Breaking it up onto multiple lines only makes the file larger (but humans seem to like it).

Chip H.