Assertion: birch's bark | /r/ObjectUse | used as the drainage layer
Facets:
value: in roofs
type: LOCATION
value: for backpacks etc
type: PURPOSE
value: for shoes
type: PURPOSE
Source sentences:
text: Some barks can be removed in long sheets; the smooth surfaced bark of birch trees has been used as a covering in the making of canoes, as the drainage layer in roofs, for shoes, backpacks etc.