# File lib/nokogiri/xml/sax/document.rb, line 105
        def start_element_namespace name, attrs = [], prefix = nil, uri = nil, ns = []
          ###
          # Deal with SAX v1 interface
          name = [prefix, name].compact.join(':')
          attributes = ns.map { |ns_prefix,ns_uri|
            [['xmlns', ns_prefix].compact.join(':'), ns_uri]
          } + attrs.map { |attr|
            [[attr.prefix, attr.localname].compact.join(':'), attr.value]
          }.flatten
          start_element name, attributes
        end