# Version 9.2.0

## Content

## New Features and Improvements

The following features have been added to this version of the product:

* Support for the PDF/A-4 conformance levels: the `PdfA4`, `PdfA4e` and `PdfA4f` members were added to the `PdfAConformanceLevel` enumeration.
* Support for generating documents that comply with the PDF/UA-2 specification.
* Added `Model3DAnnotation` class: Represents a 3D annotation.
* Added `Model3DView`, `Model3DViewCollection` and `Model3DStream` classes: Represent the views and the 3D data of a 3D annotation.
* Added `Matrix3D` structure: Represents a 3D transformation matrix.
* Added `Namespace` and `NamespaceCollection` classes: Represent the structure namespaces of a tagged PDF document.
* Added `StructTreeRoot.Namespaces` property: Gets the collection of structure namespaces used in the document.
* Added `StructElement.NS` property: Gets or sets the structure namespace of the structure element.
* Added `ContentItem.StructElement` property: Gets the structure element that owns the content item.
* Added `Metadata.PdfRev` and `Metadata.PdfUaRev` properties: Get or set the PDF and PDF/UA revision identifiers stored in the document metadata.
* Added overloads of the `DestinationXYZ`, `DestinationFit`, `DestinationFitH`, `DestinationFitV`, `DestinationFitR`, `DestinationFitB`, `DestinationFitBH` and `DestinationFitBV` constructors that accept a `StructElement` as the destination target.

## Resolved Issues

* Various bug fixes and stability improvements.