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8.1 Overview <snip> Resources provided in a theme can also be accessed using the ThemeResource class, as described in Section 4.5.4, “Theme Resources”. This allows using theme resources, such as images, for example in Embedded objects and other objects that allow inclusion of images using resources.
4.5.4. Theme Resources
Theme resources are files included in a theme, typically images. See Chapter 8, Themes for more information on themes.