Assertion: fountain pen's cap | /r/CapableOf | fit over the nib of the pen
Facets:
value: to protect it
type: PURPOSE
Source sentences:
text: Although fountain pens are available in a variety of styles offering unique features, each is comprised of the same basic components: the nib, or point; the barrel, which holds the ink reservoir, and the cap, which fits over the nib of the pen to protect it from damage.