<dataSpec xmlns="http://www.tei-c.org/ns/1.0" rend="add" ident="data.MEASUREMENTSIGNED" module="MEI">
<desc xml:lang="en">Measurement expressed in real-world (
<abbr>e.g.</abbr>, centimeters, millimeters, inches, points,
picas, or pixels) or virtual units (vu). 'vu' is the default value. Unlike
data.MEASUREMENTUNSIGNED, in which only positive values are allowed, both positive
and negative
values are permitted.</desc>
<content>
<dataRef name="token">
<dataFacet name="pattern" value="(\+|-)?\d+(\.\d+)?(cm|mm|in|pt|pc|px|vu)?"/>
</dataRef>
</content>
</dataSpec>