The link element specifies the name of an author, of a keyword, the title of a periodical, or a reference by means of the target attribute. The type attribute selects which database object the note is attached to.
<xnote id="1" citekey="markus2005" date="2005-10-12" share="public"> <title>myfirstnote</title> <content>The note text proper</content> <keyword>biochemistry</keyword> <keyword>enzymes</keyword> <link type="reference" target="WANG2002"/> <link type="reference" target="Phadke1994"/> <link type="author" target="Walsh,N."/> <link type="journalabbrev" target="Biochem.Pharmacol."/> </xnote>