This example references a definition of a measurement unit declared in the TEI header:
<measure type="weight"> <num>2</num> pounds of flesh </measure> <measure type="currency">£10-11-6d</measure> <measure type="area" unitRef="#merk">2 <unit>merks</unit> of old extent</measure> <!-- In the TEI Header: --> <encodingDesc> <unitDecl> <unitDef xml:id="merk" type="area"> <label>merk</label> <placeName ref="#Scotland"/> <desc>A merk was an area of land determined variably by its agricultural productivity.</desc> </unitDef> </unitDecl> </encodingDesc>
<head>Long papers.</head> <p>Speakers will be given 30 minutes each: 20 minutes for presentation, 10 minutes for discussion. Proposals should not exceed <measure max="500" unit="count" commodity="words">500 words</measure>. This presentation type is suitable for substantial research, theoretical or critical discussions.</p>