public UpdatePackageGroupRequest withDomainOwner(String domainOwner) {
        setDomainOwner(domainOwner);
        return this;
    }
<p>
The 12-digit account number of the Amazon Web Services account that owns the domain. It does not include dashes
or spaces.
</p>

@param domainOwner
       The 12-digit account number of the Amazon Web Services account that owns the domain. It does not include
       dashes or spaces.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-codeartifact/src/main/java/com/amazonaws/services/codeartifact/model/UpdatePackageGroupRequest.java