class Nokogiri::XML::Node

def namespaces

has no explicit default namespace.
default namespaces set on ancestor will NOT be, even if self
set on self will be included with key "xmlns". However,
such as "xmlns:prefix", not just the prefix. Default namespace
XML attributes that would be used to define this namespace,
attribute-name/value pairs. Note that the keys in this hash
element directly or any ancestor node -- as a Hash of
Returns namespaces in scope for self -- those defined on self

This method returns the same namespaces as #namespace_scopes.

node and its ancestors.
Returns a Hash of {prefix => value} for all namespaces on this
## 
def namespaces
  Hash[*namespace_scopes.map { |nd|
    key = ['xmlns', nd.prefix].compact.join(':')
    if RUBY_VERSION >= '1.9' && document.encoding
      begin
        key.force_encoding document.encoding
      rescue ArgumentError
      end
    end
    [key, nd.href]
  }.flatten]
end