Proposal for Case Tagging

• N means nominative OR vocative with nominative form
• A means unambiguously accusative
• V means specifically vocative form
• C means nominative or accusative (or vocative) syncretism
• G means unambiguously genitive
• D means unambiguously dative

Do we need something for syncretism between dative and genitive?

UPDATE: In IE studies, NAV are sometimes called strong cases and GD weak. I'm wondering if C should be changed to S and we use W for the dative-genitive syncretism.