Enhance README.org and export it to .md
Significant refactoring
* ox-skos.el: Update comment section about new keywords.
(org-skos-uri-separator, org-skos-id-separator)
(org-skos-ISO-25964): New options.
(skos): Use new keywords.
(org-skos-i18n, org-skos-headline, org-skos-build-iso-thes-term)
(org-skos-build-iso-thes-terms)
(org-skos-build-top-level-description, org-skos-template):
Significant refactoring. Use new keywords and options.
Add skos-xl and iso-thes data
* ox-skos.el (org-skos-uri-separator, org-skos-terms): New
variables.
(org-skos-export-as-skos, org-skos-export-to-skos)
(org-skos-publish-to-skos): Initialize `org-skos-terms'.
(org-skos-i18n): Accept a fourth argument `conceptschemeuri',
generated the iso-thes string and mutate `org-skos-terms' to
contain the iso-thes term for later insertion.
(org-skos-headline): Fix `org-skos-i18n' arguments.
(org-skos-build-iso-thes-term, org-skos-build-iso-thes-terms): New
function to add the list of iso-thes terms stored in
`org-skos-terms'.
(org-skos-template): Use `org-skos-build-iso-thes-terms' to insert
the list of iso-thes terms.
Fix duplicate entry in let binding
* ox-skos.el (org-skos-headline): Fix duplicate entry in let
binding.
Add .gitignore
Ignore ChangeLog
Fix comment
* ox-skos.el (org-skos-build-top-level-description): Fix comment.
Add <iso-thes:status>
* ox-skos.el (org-skos-headline): Add <iso-thes:status>
(defaulting to "1").
Use the :ID property value as URI when available
* ox-skos.el (org-skos-headline): Use the :ID property value as
URI when available. Add <dct:modified> and <dct:created>.
(org-skos-build-top-level-description): Use the :ID property value
as URI when available.
Add more information in preamble
* ox-skos.el (skos): Add keywords.
(org-skos-headline): Use <skos:Concept> instead of
<rdf:Description>.
(format-time-string-ISO-8601): New function.
(org-skos-build-top-level-description): Use new keywords. Use
<skos:ConceptScheme> instead of <rdf:Description>.