What's the difference between ${URI} and ${URI

What's the difference between ${URI} and ${URI_REF}

All this talk about notifications had me poking around and I just learned about using ${URI_REF} instead of ${URI}. It's magical.

${URI_REF} creates a link to the current record using the records display value. So it's essentially... the same as;

var url = 'https://' + gs.getProperty('instance_name') + '.service-now.com/';
url += current.getLink();
template.print('<a href="' + url + '">' + current.getDisplayValue() + '</a>');

${URI} creates a link to the current record using the text "Link".