Some properties of form fields are not extracted, for example 'background color', 'border color' und 'border styles'.
Currently not all signature data is exported into XML. It is possible that the XML structure will change in future releases.
In the current release 2016.05 colors cannot be tested directly. If colors have to be tested, the test has to be carried out using rendered pages. The sections 3.20: “Layout - Entire PDF Pages” and 3.21: “Layout - in Page Regions” describe such tests.