Currently, the export of lists to text is not supported.

Add support for ShadingType 1.

This will allow the import of Tensor-product patch mesh gradients. Currently, importing documents that contain ShadingType 7 results in NotSupportedShadingTypeException.

This type of shading is not supported in the current version and a NotSupportedException is thrown when importing documents containing it.

The exception can be suppressed using the Exception Handling mechanism of PdfProcessing.

A shading dictionary specifies details of a particular gradient fill, including the
type of shading to be used, the geometry of the area to be shaded, and the geometry of the gradient fill. Various shading types are available, depending on the value of the dictionary’s ShadingType entry:

• Coons patch meshes (type 6) construct a shading from one or more color
  patches, each bounded by four cubic Bézier curves.

XlsFormatProvider: Add support for hidden rows.

Add support for superscript and subscript font effects for cell formatting. Currently, this is not supported by the model and is omitted on import.

Introduce an API for Cloning RadFixedPages.

Implement the Exponential Interpolation Function in PdfProcessing. Currently, NotSupportedFunctionTypeException is thrown with a message "Function type 2 is not supported."

At this point, XlsFormatProvider doesn't support images and they are not imported into Workbook while reading an .xls file.

Add support for strikethrough font effect for cell formatting. Currently this is not supported by the model and is omitted on import.

With the current implementation when exporting a Stitching function all the containing functions are exported as Sampled functions even if they originally have been imported as Exponential interpolation functions, which leads to an increase in the size of the document.

More information can be found in the PDF Specification.

At this point XLS import of SpreadProcessing does not have support for notes/comments.

Add support for PDF Portfolios.

Add support for creating Tables and applying tables styles (predefined ones or custom).

https://loc.gov/preservation/digital/formats/fdd/fdd000532.shtml

PDF/A‑4f is a version of PDF/A designed for archival storage that:

• Ensures long‑term visual and structural preservation
• Is based on modern PDF 2.0
• Allows embedded files (attachments) that are also archival‑compliant 

 

Add Write/Export support for XMP core properties. This includes the following steps:

Make Schema Properties Mutable
Implement Schema Serialization Methods
Extend XMP Writer for Serialization
Integrate XMP Writer with Document Export

This is preserved in the xml once saved from MS Excel:

Expose internal GrayColor object.

PdfFormatProvider: Export accessible PDFs.