This class represents the collection subitem dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 49, page 107.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 47, page 139.

A collection subitem dictionary holds the value of a single field in a PDF portfolio collection item. The data type of the value must match the subtype declared for that field in the collection schema.

The D entry holds the actual data value: a string for text or date fields, a number for numeric fields, or a boolean. The P entry, when false, indicates that the field data is not present for this item even though the entry exists in the dictionary.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.CollectionSubItemElement