For boarding passes and event tickets, semantic tags add structured data — such as event dates, venue locations, or flight details — that the system uses to enable features like Siri Suggestions, Calendar integration, and Maps directions.

Pass Designer lets you edit semantic tags directly in the UI, and you can view a semantic and non-semantic pass side by side. It can also automatically generate a backward-compatible pass structure from your semantic data that doesn’t require semantic tags, ensuring your pass works where they may not be supported.