# File lib/xsd/xmlparser.rb, line 24
  def filter_ns(ns, attrs)
    ns_updated = false
    if attrs.nil? or attrs.empty?
      return [ns, attrs]
    end
    newattrs = {}
    attrs.each do |key, value|
      if NSParseRegexp =~ key
        unless ns_updated
          ns = ns.clone_ns
          ns_updated = true
        end
        # tag == '' means 'default namespace'
        # value == '' means 'no default namespace'
        tag = $1 || ''
        ns.assign(value, tag)
      else
        newattrs[key] = value
      end
    end
    return [ns, newattrs]
  end