public com.google.api.ads.admanager.axis.v201811.UserDomainTargeting getUserDomainSegment() {
        return userDomainSegment;
    }
public com . google . api . ads . admanager . axis . v201811 . UserDomainTargeting getUserDomainSegment ( ) { return userDomainSegment ; }
Gets the userDomainSegment value for this ProductSegmentation.

@return userDomainSegment   * The user domain segmentation. {@link UserDomainTargeting#isTargeted}
must be {@code true}.

<p>This attribute is optional.