Grab http://www.xpsdev.com/content/files/xps-document-example.xps and issue `okular xps-document-example.xps` in an xterm. Observe that the background and the images are not shown (compare to how mupdf shows the same file). A screenshot of page 3 is attached.
The following messages are printed in the console:
org.kde.okular.generators.xps: Successful open of "/tmp/XPS_files/xps-document-example.xps"
org.kde.okular.generators.xps: document file name: "/Documents/1/FixedDocument.fdoc"
org.kde.okular.generators.xps: Page Path: "Pages/1.fpage"
org.kde.okular.generators.xps: Page Path: "Pages/2.fpage"
org.kde.okular.generators.xps: Page Path: "Pages/3.fpage"
org.kde.okular.generators.xps: Page Path: "Pages/4.fpage"
org.kde.okular.generators.xps: Page Path: "Pages/5.fpage"
org.kde.okular.generators.xps: Page Path: "Pages/6.fpage"
org.kde.okular.generators.xps: Could not open Document relationship file from "/Documents/1/_rels/FixedDocument.fdoc.rels"
org.kde.okular.generators.xps: generating document synopsis
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Reference "{StaticResource b1}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "ResourceDictionary"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "ResourceDictionary"
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Reference "{StaticResource b1}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "ResourceDictionary"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "ResourceDictionary"
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Reference "{StaticResource b1}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "ResourceDictionary"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "ResourceDictionary"
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Parse result: true
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "ResourceDictionary"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction start: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "GradientStop"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush.GradientStops"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "LinearGradientBrush"
org.kde.okular.generators.xps: Unhandled element in Text Extraction end: "ResourceDictionary"
org.kde.okular.generators.xps: Reference "{StaticResource b0}"
org.kde.okular.generators.xps: Parse result: true
QThreadStorage: Thread 0x561c7d8ca8d0 exited after QThreadStorage 10 destroyed