不要将空字符串序列化为XML

I've got a library project where object are serialized to XML format for further download by users in ASP.NET application. Additionaly i've used XSD to generate types for serialization. The number of types for serialization is very big. Each type is serialized to its own XML. Some types have string properties, sometimes those properties contains empty strings. During serializations those properties are been serialized to some like this I've got a library project where object are ser