Content Types
Not knowing where to go after looking at the high level structure, I started at the root by looking at the [Content_Types].xml file. Content types used within an XPS document will clearly depend upon the content you have. For the purposes of this discussion, I will only cover the typical content types.
| Ext |
Mime Type / XML Namespace |
| fdoc |
application/vnd.ms-package.xps-fixeddocument+xml
http://schemas.microsoft.com/xps/2005/06 |
| fdseq |
application/vnd.ms-package.xps-fixeddocumentsequence+xml
http://schemas.microsoft.com/xps/2005/06/fixedrepresentation |
| fpage |
application/vnd.ms-package.xps-fixedpage+xml
http://schemas.microsoft.com/xps/2005/06 |
| jpg |
image/jpeg |
| odttf |
application/vnd.ms-package.obfuscated-opentype |
| rels |
application/vnd.openxmlformats-package.relationships+xml
http://schemas.openxmlformats.org/package/2006/relationships |
| xml |
application/vnd.ms-printing.printticket+xml
http://schemas.microsoft.com/windows/2003/08/printing/printschemaframework
http://www.w3.org/2001/XMLSchema-instance
http://www.w3.org/2001/XMLSchema
http://schemas.microsoft.com/windows/2006/06/printing/printschemakeywords/microsoftxpsdocumentwriter
http://schemas.microsoft.com/windows/2003/08/printing/printschemakeywords |
As you can see, most of the content types are XML, which speaks to the openness of the specification. The only types not XML-based are the images and font (.odttf) files. Speaking of the font files, I'm not wholely sure what format they're in; they're not any of the typical font formats. Of course, since the mime type notes the file is obfuscated, that tells me it wouldn't be the same, anyway. If I had to guess, I'd say the file only contains information on the characters used in the document they're related to. This would save on space.