[niso-sts] Where to put <long-desc>

["Denise French dfrenchlibrary@xxxxxxxxx" <niso-sts-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Please be patient with me, I have another question:

I read in the element description of <long-desc> that: "Best Practice is to
incorporate a textual description, including or ending with an untagged
URI, and repeat the URI in the @xlink:href
<http://www.niso-sts.org/TagLibrary/niso-sts-TL-1-0-html/attribute/xlink-href.html>
attribute
so that a link can be made."

What I don't see is what it should link TO. And if, as I guess, it should
link to a textual description, where should that description be? It seems
logical that it should be part of the XML of the document, because if it is
not it won't be transmitted with the document. But ... where. And tagged
how? And if NOT part of the document, then where should it be and how will
people know to point to it?

Thank you.