The URI (such as, for example, a URL) for an online version of a print article. This element may be used when an article is available in multiple forms, for example, both in print and in an expanded version with additional graphics available online.
The URI may be used as a live link, typically naming a website, or the element content may name the URL, for example, and use the link attributes to hold the real link:
<self-uri xlink:href="...">An expanded version of this article is available online</self-uri>
Text, numbers, or special characters
No sample is available at this time, as this is a very rare element.