Create obl-unmarked.md (#1028)

_en/dep/obl-unmarked.md

@@ -0,0 +1,57 @@
+---
+layout: relation
+title: 'obl:unmarked'
+shortdef : 'adpositionless oblique'
+udver: '2'
+---
+
+This relation is a subtype of the [obl]() relation that applies
+when an oblique takes the form of a nominal lacking a preposition
+(a.k.a. a noun phrase). It is "unmarked" in that, unlike most obliques,
+it has no adposition.
+
+`obl:unmarked` merges two older subtypes, `obl:npmod` and `obl:tmod`.
+
+Examples include:
+
+(i) a temporal adverbial in a clause
+
+~~~ sdparse
+Last night , I swam in the pool
+obl:unmarked(swam, night)
+~~~
+
+(ii) a measure phrase, which is the relation between the head of an
+adjectival/adverbial or prepositional phrase and the head of a measure
+phrase modifying it:
+
+~~~ sdparse
+The director is 65 years old
+obl:unmarked(old, years)
+~~~
+
+~~~ sdparse
+6 feet long
+obl:unmarked(long, feet)
+~~~
+
+
+(iii) noun phrases giving an extent to a verb, which are not objects:
+
+~~~ sdparse
+Shares eased a fraction
+obl:unmarked(eased, fraction)
+~~~
+
+
+(iv) floating reflexives
+
+~~~ sdparse
+The silence is itself significant
+obl:unmarked(significant, itself)
+~~~
+
+
+and (v) certain other absolutive nominal constructions.
+
+**History:** Prior to release 2.15, case (i) (temporal adverbials) had a separate subtype called `obl:tmod`, and `obl:npmod` was used for the non-temporal ones.