Problem

When trying to open an exported XML file with feature definitions in the "Features XML To/From Excel" tool, a following error message is shown:

"Error reading the Feature XML File: There is an error in XML document (xx, xxx)"

Solution

Use dots as deliminators instead of commas in the feature definitions.

Also bear in mind the following limitations of the features xml tool:

Some special characters may not be supported. For example if working in an environment where the decimal separator is a comma and not a decimal place, this will cause the application to fail. There is no list available for what is or is not supported. If you get a failure, check for the use of special characters.
Using a feature definition or symbology name that begins with an underscore "_" is not supported.
This utility does not support feature definitions for Subsurface Utilities. The import and export of SU features is supported via the *.xml file import export process, but this utility will not convert the SU features to and from Excel. The Feature symbologies used by SU are supported to and from Excel. It is only the Features that are not.