[Attribute] lang [Data type] string [Required] No [Default value] None [Description] 
The target locale of the XML payload, specified as a BCP-47 language tags such as "en-US" or "fr-FR". The locale specified here overrides that in visual, but can be overriden by that in text. If this value is a literal string, this attribute defaults to the user's UI language. If this value is a string reference, this attribute defaults to the locale chosen by Windows Runtime in resolving the string. See Remarks for when this value isn't specified.