The preposition semantics routine for of is called with tok1
and tok2 as arguments. The discrimination net in ofsem
classifies this use of of as being of the form:
< location> of < object> .
ofsem calls idrfnt to identify the referent of ``a pole''.
This causes tok2 to be assigned the semantic frame physent
and causes an object pole3 to be created and added to the internal model.
The modifier (length 10 ft) is transferred to the new object at this
mods ((length 10 ft))