XML Paper Specification file format has different non-image data that can be stored in a package as XML or resources. ImageGear allows reading and writing the following XPS non-image data:

Tag Name	Tag ID	Description
Category	IGMDTAG_ID_XPS_CATEGORY	The category of the content that is contained in the file.
ContentStatus	IGMDTAG_ID_XPS_CONTENTSTATUS	Example ContentStatus values include "Draft", "Reviewed", and "Final".
ContentType	IGMDTAG_ID_XPS_CONTENTTYPE	Example ContentType values include "Whitepaper", "Security Bulletin", and "Exam".
Created	IGMDTAG_ID_XPS_CREATED	The date and time the file was initially created.
Creator	IGMDTAG_ID_XPS_CREATOR	The individual or entity that created the file and its content.
Description	IGMDTAG_ID_XPS_DESCRIPTION	The Description may include but is not limited to: an abstract, table of contents, reference to a graphical representation of content, or a free-text account of the content.
Identifier	IGMDTAG_ID_XPS_IDENTIFIER	A value that unambiguously identifies the file and its content.
Keywords	IGMDTAG_ID_XPS_KEYWORDS	A delimited set of keywords to support searching and indexing the Package and content.The Keywords property typically contains a list of terms that are not available elsewhere in file metadata.
Language	IGMDTAG_ID_XPS_LANGUAGE	A value that identifies the file content language.
LastModifiedBy	IGMDTAG_ID_XPS_LASTMODIFIEDBY	The user who last modified the file content.
LastPrinted	IGMDTAG_ID_XPS_LASTPRINTED	The date and time the file content was last printed.
Modified	IGMDTAG_ID_XPS_MODIFIED	The date and time the file was last changed.
Revision	IGMDTAG_ID_XPS_REVISION	The revision number of the file. The Revision property indicates the number of changed saves or revisions. The application is responsible for updating the Revision property value after each revision.
Subject	IGMDTAG_ID_XPS_SUBJECT	The topic of the file content.
Title	IGMDTAG_ID_XPS_TITLE	The name given to the file and its content.
Version	IGMDTAG_ID_XPS_VERSION	The version number of the file.