A collection item: the values a file in a portable collection shows for each field of the collection's schema. A live view over the collection item dictionary.
public sealed class PdfCollectionItem
ISO 32000-2 §7.11.6 (PDF 1.7), Tables 46 and 47. Each entry other than Type is keyed by a schema field key and holds a
text string, a date, a number, or a collection subitem dictionary (data D plus a prefix P that sorting ignores).
kind:method, kind:property, kind:ctor. Press Esc to clear.DictionaryGets the collection item dictionary.KeysGets the field keys the item has values for, in the order they are stored.GetValue(String)Returns the item's value for the schema field fieldKey, or null when it has none.