/**
* A URL/resource name that uniquely identifies the type of the serialized
- * protocol buffer message. The last segment of the URL's path must represent
+ * protocol buffer message. This string must contain at least
+ * one "/" character. The last segment of the URL's path must represent
* the fully qualified name of the type (as in
* `path/google.protobuf.Duration`). The name should be in a canonical form
* (e.g., leading "." is not accepted).