class REXML::Attributes

def []=( name, value )


attrs.include?('baz:att') # => false
attrs['baz:att'] = nil

When +value+ is +nil+, deletes the attribute if it exists:

attrs['baz:att'] = '3' # => "3"
attrs['foo:att'] = '2' # => "2"
attrs = ele.attributes
ele = d.root.elements['//ele'] # =>
d = REXML::Document.new(xml_string)
EOT



xml_string = <<-EOT

overwriting the previous value if it exists:
assigns that to the attribute for the given +name+,
When +value+ is non-+nil+,

[name] = value -> value
:call-seq: 
def []=( name, value )
  if value.nil?             # Delete the named attribute
    attr = get_attribute(name)
    delete attr
    return
  end
  unless value.kind_of? Attribute
    if @element.document and @element.document.doctype
      value = Text::normalize( value, @element.document.doctype )
    else
      value = Text::normalize( value, nil )
    end
    value = Attribute.new(name, value)
  end
  value.element = @element
  old_attr = fetch(value.name, nil)
  if old_attr.nil?
    store(value.name, value)
  elsif old_attr.kind_of? Hash
    old_attr[value.prefix] = value
  elsif old_attr.prefix != value.prefix
    store value.name, {old_attr.prefix => old_attr,
                       value.prefix    => value}
  else
    store value.name, value
  end
  return @element
end