<classSpec ident="att.curvature" module="MEI.shared" type="atts">
<desc>Attributes that describe curvature.</desc>
<attList>
<attDef ident="curvedir" usage="opt">
<desc>Describes a curve with a generic term indicating the direction of curvature.</desc>
<valList type="closed">
<valItem ident="above">
<desc>Upward curve.</desc>
</valItem>
<valItem ident="below">
<desc>Downward curve.</desc>
</valItem>
<valItem ident="mixed">
<desc>A "meandering" curve, both above and below the items it pertains to.</desc>
</valItem>
</valList>
</attDef>
</attList>
</classSpec>