Error
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Create a new NotWellFormedError for an error at line in element.  If a block is given the return value of the block ends up in the error message.
 
               # File rss/parser.rb, line 16
def initialize(line=nil, element=nil)
  message = "This is not well formed XML"
  if element or line
    message << "\nerror occurred"
    message << " in #{element}" if element
    message << " at about #{line} line" if line
  end
  message << "\n#{yield}" if block_given?
  super(message)
end