Tree Class

The logical structure of a document is described by a hierarchy of objects called the structure hierarchy or structure tree.

The structure tree root is not made accessible through this interface, but it permits the creation of and reference to a Document node directly below the structure tree root.

It is only possible to use this interface to create a structure tree on a new document with no content that could have contained document structure copied from an existing document. Attempts either to create a structure tree in a document containing content copied without setting the copy option CopyLogicalStructure to or to copy content into a document with a created structure tree afterwards will fail.

When creating a structure element tree, the document metadata will automatically be updated to reflect that this is a tagged PDF.