ULINK description

## Description

The ulink element contains an URL of a resource.

The type attribute further specifies the URL, indicating whether it points to a PDF file, to the full text of some article, to related material, to an image, or something else.

## Example

    <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."/>
    <ulink type="pdf">http://dot.com/foo.pdf</ulink>
    <ulink type="image">http://dot.com/geewhiz.jpg</ulink>
    </xnote>