...
<sec sec-type="norm-refs">
<label>2</label>
<title>Normative references</title>
<p>The following referenced documents are indispensable for the application 
of this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments)
applies.</p>
<ref-list>
<ref>
<std type="dated" std-id="iso:std:iso:8990:ed-1">
<std-ref type="dated"><originator>ISO</originator>
<doc-number>8990</doc-number>:<year>1994</year></std-ref>,
<title>Thermal insulation — Determination of steady-state thermal
transmission properties — Calibrated and guarded hot box</title>
</std>
</ref>
<ref>
<std type="multipart" std-id="iso:std:iso:tr:3834">
<std-ref type="undated"><originator>ISO</originator>/<doc-type>TR</doc-type>
<doc-number>3834</doc-number> <part-number>(all parts)</part-number></std-ref>, 
<title>Quality requirements for fusion welding of metallic materials</title>
</std>
</ref>
<ref>
<std>
<std-ref type="undated">ASTM C 1199-09e1</std-ref>, <title>Standard 
Test Method for Measuring the Steady-State Thermal Transmittance 
of Fenestration Systems Using Hot Box Methods</title>
</std>
</ref>
</ref-list>
</sec>
...