Assertion: building's roof | /r/LocatedNear | parapet walls
Facets:
value: often
type: TEMPORAL
value: with openings
type: OTHER
value: to allow
type: PURPOSE
Source sentences:
text: Flat roofs, which usually include at least a nominal slope to shed water, are often surrounded by parapet walls with openings (called scuppers) to allow water to drain out.