src/main/java/com/passkit/grpc/Flights/PassengerOuterClass.java
public Builder clearIdentityDocument() {
        
        identityDocument_ = 0;
        onChanged();
        return this;
      }
/**
       * <pre>
       * Type of document used to validate the traveler's identity.
       * </pre>
       *
       * <code>.flights.IdentityDocument identityDocument = 1;</code>
       * @return This builder for chaining.
       */

Type of document used to validate the traveler's identity.

.flights.IdentityDocument identityDocument = 1;
@return This builder for chaining.
Type of document used to validate the traveler ' s identity . . flights . IdentityDocument identityDocument = 1 ; @return This builder for chaining .
public Builder clearIdentityDocument() {
        identityDocument_ = 0;
        onChanged();
        return this;
      }
public Builder clearIdentityDocument ( ) { identityDocument_ = 0 ; onChanged ( ) ; return this ; }
<pre>
 Type of document used to validate the traveler's identity.
<pre > Type of document used to validate the traveler ' s identity .