Labelling of patents, standards and other normative documents

[a-fent]

Referencing discussion in https://github.com/inukshuk/anystyle/pull/105

Since these kind of documents do appear in some scientific fields, it would be nice to do something with them. They are mentioned in CSL and Biblatex specs as types with particular fields but without much information. The 'authority' field is pretty clear, there is a 'number' field and a 'type' field, but what should be labelled as these is not so clear; I am still experimenting with a corpus. Fortunately they are different enough to citations of articles, chapters and so forth that including these doesn't appear to affect the correct parsing of those.

Some examples:

<?xml version="1.0" encoding="UTF-8"?>
<dataset>
  <sequence>
	<type>Regulation</type>
	<number>2016/425/UE</number>
	<title>on protective personal equipment and repealing Council
	Directive 89/686/EEC</title>
  </sequence>
  <sequence>
	<type>Council Directive</type>
	<number>89/686/EEC</number>
	<date>of 21 December 1989</date>
	<title>on the
	approximation of the laws of the Member States relating to personal
	protective equipment</title>
  </sequence>
  <sequence>
	<authority>International Marine Contractors Association</authority>
	<title>“Guidance on Operational Activity Planning”,</title>
	<number>IMCA M220,</number>
	<date>November 2012</date>
  </sequence>
  <sequence>
	<number>EN511,</number>
	<title>Gloves giving protection against cold</title>
  </sequence>
  <sequence>
	<citation-number>[34]</citation-number>
	<number>NORSOKC-001,</number>
	<title> Living quarters area</title>
  </sequence>
  <sequence>
	<authority>UK Health and Safety Executive,</authority>
	<number>RR062</number>
	<title> Factoring the human into
	safety: Translating research into practice. Executive Summary for
	Volumes 1, 2 and 3</title>
  </sequence>
  <sequence>
	<authority>National Institute for Occupational Safety and Health (NIOSH).</authority>
	<title> Respiratory Protective Devices.</title>
	<type>Code of Federal Regulations, </type>
	<number>Title 42, Part 844</number>
  </sequence>
</dataset>