An in-text link to an external file that provides supplementary information for the document, for example, an audio clip
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<p>The molecular determinants of transcription-complex stability
and processivity are understood poorly. Several competing
mechanistic models of RNAP function have been proposed ...</p>
<supplementary-material id="S1"
xmlns:xlink="http://www.w3.org/1999/xlink"
xlink:title="local_file"
xlink:href="1471-2105-1-1-s1.pdf"
mimetype="application/pdf">
<label>Additional material</label>
<caption>
<p>Supplementary PDF file supplied by authors.</p>
</caption>
</supplementary-material>
<p>RNAPs seem to have arisen twice in evolution (see the
<inline-supplementary-material
xmlns:xlink="http://www.w3.org/1999/xlink"
xlink:title="local_file" xlink:href="timeline">Timeline
</inline-supplementary-material>. A large family of multisubunit
RNAPs includes bacterial enzymes, archeal enzymes, eukaryotic
nuclear RNAPs, plastid-encoded chloroplast RNAPs, and RNAPs
from some eukaryotic viruses. Members of this family exhibit
extensive sequence and structural similarities ...</p>
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