For every combination of DataSet ID and Record ID there is a
name describing the field.
We hold the names of the majority of common IPTC items in use.
However there may be situations in which we cannot find a valid
name for the DataSet and Record IDs. In these cases this property
will be blank.
The complete list of registered DataSets and Records can be
obtained from the International Press Telecommunications Council
web site at http://www.iptc.org.