<space>

<space>
Moduletranscr
Contained by
May containEmpty element
Schematron

<sch:rule context="tei:space">
<sch:report test="@quantity and @extent">space
may have @quantity (a figure) or @extent (a descriptive text value) but not both</sch:report>
<sch:report test="@quantity and not(@unit)">If space has @quantity then
@unit is required</sch:report></sch:rule>