class Metanorma::Utils::Namespace

def ns(path)
  return path if @namespace.nil?
  path.gsub(%r{/([a-zA-Z])}, "/xmlns:\\1")
    .gsub(%r{::([a-zA-Z])}, "::xmlns:\\1")
    .gsub(%r{\[([a-zA-Z][a-z0-9A-Z@/]* ?=)}, "[xmlns:\\1")
    .gsub(%r{\[([a-zA-Z][a-z0-9A-Z@/]*\])}, "[xmlns:\\1")
end