A list of variable names for which no answer was present during assembly of the document. Before an assembly has occurred, this property will be null. After an assembly is complete, this property will be an array of strings. Each string is the name of a variable for which an answer was called for during assembly (either to merge into the document, or in the evaluation of some other expression or rule encountered during assembly), but for which no answer was present in the AnswerCollection.

public IEnumerable<string> UnansweredVariables { get; internal set; }

public IEnumerable<string> UnansweredVariables { get; internal set; }