Syntax: A single line
A tagged line.Syntax: A single line with leading spaces
Another tagged line, with leading spaces.Syntax: Area (block)
A tagged area delimited by lines with marks.Syntax: Area (block) with trailing spaces
Trailing spaces and TABs after the area marks are allowed, but not encouraged nor documented.Invalid: No space between mark and contents
'''Not a tagged line, need one space after mark.
Invalid: Leading spaces on block marks
''' Not a tagged area. The marks must be at the line beginning, no leading spaces. '''