Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more
Raised when an incorrect value is used.
# File rss/rss.rb, line 135
def initialize(tag, value, attribute=nil)
@tag, @value, @attribute = tag, value, attribute
message = "value <#{value}> of "
message << "attribute <#{attribute}> of " if attribute
message << "tag <#{tag}> is not available."
super(message)
end