Editing Module:Cite IUCN/doc (section)

===Current IUCN citations===

A typical IUCN citation, as given on their assessment pages, is now of the form:

:Goodrich, J., Lynam, A., Miquelle, D., Wibisono, H., Kawanishi, K., Pattanavibool, A., Htun, S., Tempa, T., Karki, J., Jhala, Y. & Karanth, U. 2015. ''Panthera tigris''. ''The IUCN Red List of Threatened Species'' 2015: e.T15955A50659951. https://dx.doi.org/10.2305/IUCN.UK.2015-2.RLTS.T15955A50659951.en. Downloaded on 19 December 2019.
:where the electronic page number <code>e.T15955A50659951</code> contains the taxon ID (between the T and A) and the assessment ID (after the A). These two identifying numbers are also contained in the doi.

When there is an amendment to an assessment, a new assessment number is assigned, which causes a change in the electronic page number and the url of the page. 

The behaviour of the doi is unusual. A new assessment does not cause a new doi, it retains the original assessment number. If this is used by a template to construct a url, it will be to the original version of the assessment. However, if the url of the doi is followed, the IUCN doi resolver redirects to the latest assessment. The target of the doi has changed to the revised version of the IUCN assessment. Thus if the template uses the doi url the linked page will change from the one seen by the editor who added the citation.

Therefore this module will create a url with the following order of precedence:
# Use the electronic page number set by the {{para|page}} parameter to generate the url.
# Use the {{para|id}} to generate the url if it is of the two new-style two part form, i.e. <code>TAXON_ID/ASSESSMENT_ID</code> (e.g. <code>15955/50659951</code>)
# Use the {{para|doi}} parameter to generate the url. This is last choice because it uses the number of the original  assessment even when the assessment has been amended.
When none of the above options are available, and when {{para|url}} has the old form, this module will change the scheme from <code>http://</code> to <code>https://</code> in an attempt to make a working link (see next section).