(:
    Find the authors in the document.
    Over bibliography.xml on the class web portal!
    parke godfrey 2013-11-06

    LET is an XQuery clause.  It allows one to assign a variable
    a node, node-list, or value.  Here, we assign it a string
    (a URI).  We access a remote source as in a previous example,
    but with easier, nicer syntax.  (Not having to declare a
    variable.)  But to do this with LET, we have to do it as
    part of a properly formed XQuery (e.g., with FOR).

:)

let $biblio :=
    "http://"
    || "www.eecs.yorku.ca"
    || "/course_archive/2020-21/W/4415/assignment/xquery/example/"
    || "bibliography.xml"
for $author in doc($biblio)//author
return $author