Use this method to delete an existing IPTC field.
You can refer to fields either using the common names or using a
more formal "Record:DataSet" format as defined in the IPTC
specification. For more details see the Add
method.
When you delete an item referred to by name, all IPTC items with
that name are deleted. For example if you call this method with the
parameter "keyword" this will delete all keywords in the
information set.
Note that information changes are not applied until the Embed method is called.
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