| One of the dependencies that, when found in the summary but not in the article, indicates a possible error is the *"amod"* (adjectival modifier) dependency. | |
| Applied to this summary, we have *"First"* as the entity, and it is the adjectival modifier of the word *"phone"*. | |
| And indeed, this unmatched dependency indicates an actual error here. The sentence is not factual, since the article talks about a **new** type of flagship phone, | |
| and not the **first** flagship phone. This error was found by filtering on this specific kind of dependency. Empirical results showed that unmatched *amod* dependencies often suggest | |
| that the summary sentence contains an error. <br> <br> | |
| Another dependency that we use is the *"pobj"* (object of preposition) dependency. | |
| Furthermore, we only match *pobj* dependencies when the target word is *"in"*, as in this example. | |
| In this case the sentence itself contains a factual error (because the article states *"there's no word on a US release date yet"*). | |
| However, this could have already been found with entity matching (as *January 18* is unmatched), and the unmatched dependency can not be completely blamed for this error here. |