After I added agreement features to past participles, constructions like "La operacion fue realizada por un experto" no longer work. They worked before due to underspecified agreement (at the cost of overgeneration). This should be fixed of course. Possibly the "por" construction, which is already special (hd-comp-mrk) could deal with this via ICONS rather than direct index identification? This index identification between the subject and the local agreement features that the verb dictates is hard to get rid of.
After I added agreement features to past participles, constructions like "La operacion fue realizada por un experto" no longer work. They worked before due to underspecified agreement (at the cost of overgeneration). This should be fixed of course. Possibly the "por" construction, which is already special (hd-comp-mrk) could deal with this via ICONS rather than direct index identification? This index identification between the subject and the local agreement features that the verb dictates is hard to get rid of.