There are several issues with proto schema examples in 6.10.3.1. SQL query store configuration section of Configuring Data Grid Caches documentation:

• The section is showing two proto schemas where first (person) refers the second one. Attempt to create the schemas in this order will fail.
• Address proto schema is missing ; at the end of package line
• Person proto schema needs to import ${address_proto_file_name} in order so it can be successfully created.