A File Identifier is described in section 8.3 of the PDF specification. The first string is a permanent identifier based on the contents of the file at the time it was originally created, and does not change as the file is incrementally updated. The second string is a changing identifier based on the file's contents the last time it was updated.

The root of a document's object hierarchy is the catalog dictionary.

A dictionary that contains information about a CIDFont program.

A dictionary containing entries that define the character collection of the CIDFont.

Class that defines a mapping between character codes (CIDs) to a character selector (Identity-H encoding)

PDF defines a standard date format. The PDF date format closely follows the format defined by the international standard ASN.1.

A class that enables a well structured PDF document to be generated.

Class representing a file trailer.

An International Color Code stream

Represents a Identity-H character encoding

Class representing a document information dictionary.

Well-known PDF name objects.

This represents a single Outline object in a PDF, including the root Outlines object. Outlines provide the bookmark bar, usually rendered to the right of a PDF document in user agents such as Acrobat Reader

The pages of a document are accessed through a structure known as the page tree.

A Type 0 font is a composite font whose glyphs are obtained from a font like object called a CIDFont (a descendant font).

Array class used to represent the /W entry in the CIDFont dictionary.

A PDF file's cross-reference table.

An enumeration listing all the font subtypes

An enumeration listing all the fonts types available in Pdf.

The PDF specification describes two conventions that can be used to embed a string in a PDF document. This enumeration, along with the Format property can be used to select how a string will be formatted in the PDF file.