Lists the values used to specify the type of relationship between the document and the attached file.
The attached file specification has an alternative representation of the content (e.g., audio).
The attached file represents information used to derive a visual presentation (e.g. for a table or a graph).
The file specification is an encrypted payload document that should be displayed to the user if the PDF Document Processor has the cryptographic filter needed to decrypt the document.
The attached file has the original source material for the associated content.
The attached file represents a supplemental representation of the original source or data.
The relationship is unknown or does not match any relationship above.
Values listed by this enumeration are returned by the PdfFileAttachment.Relationship property.
Any other suggestions? Tell us here.