A paragraph containing only two colons indicates that the following indented or quoted text is a literal block.
Whitespace, newlines, blank lines, and all kinds of markup (like *this* or \this) is preserved by literal blocks. The paragraph containing only '::' will be omitted from the result.
The :: may be tacked onto the very
end of any paragraph. The :: will be
omitted if it is preceded by whitespace.
The :: will be converted to a single
colon if preceded by text, like this:
It's very convenient to use this form.
Literal blocks end when text returns to the preceding paragraph's indentation. This means that something like this is possible:
We start here and continue here and end here.
Per-line quoting can also be used on unindented literal blocks:
> Useful for quotes from email and > for Haskell literate programming.