<classSpec ident="att.duration.additive" module="MEI.shared" type="atts">
<desc>Attributes that permit total duration to be represented by multiple values.</desc>
<attList org="group">
<attDef ident="dur" usage="opt">
<desc>When a duration cannot be represented as a single power-of-two value, multiple
space-separated values that add up to the total duration may be used.</desc>
</attDef>
</attList>
</classSpec>