<self-uri> Uri For This Same Article Online
URI for another version of a standards document. This element may be used when the document is available in multiple forms (for example, printed and eBook and online).
The textual content of this element may be a URI (typically naming a website) when the text is used as a live link, or the element content may just be a few words and the linking attributes hold the real link.
xlink:type (fixed value = simple)
xmlns:xlink (fixed value = http://www.w3.org/1999/xlink)