optional, single

ref=identifier of the doctor to be cross-referenced

Via <doctorref ref="id_of_doctor_to_be_cross-referenced"/> access to data stored under this identifier is possible. By means of this it is possible to only make a cross-reference to a doctor instead of storing his/her data twice or more often, for example.

<examination>

—

<examination>

<uddf version="2.2.0">
    <generator>
        <!-- information about the generating software -->
    </generator>
    <diver>
        <owner id="o1">
            <!-- description of the owner of the UDDF file -->
            <examination>
                <!-- first stored examination -->
                <doctor id="dr_doolittle">
                    <!-- data of doctor -->
                </doctor>
                <!-- further description of this examination -->
            </examination>
            <examination>
                <!-- second stored examination -->
                <!-- because the doctor's data are stored above, here only a cross-referencing is needed -->
                <doctorref ref="dr_doolittle"/>
                <!-- further description of this examination -->
            </examination>
        </owner>
        <!-- here more elements -->
    </diver>
    <!-- here more sections -->
</uddf>