By default, the display name of an axis expression has slightly different syntax than the expression itself, e.g. "Max([col1])" is displayed as "Max(col1)". The display name is needed for several use cases, e.g. as category key in a color scheme and should be accessible from the API so that such use cases can be automated by IronPython scripts, C# extensions and Action Mods. In case there are multiple expressions on an axis, the API should provide the display name for each part.